Limitations and complications of endoscopic surgery for treatment for sinonasal inverted papilloma: a reassessment after 212 cases

Management of the Nasolacrimal Duct in Expanded Endoscopic Approaches to the Maxillary Sinus: A Systematic Review with Evidence-based Recommendations

BACKGROUND

Utilizing expanded endoscopic approaches to the maxillary sinus for the endonasal management of a variety of tumors is increasing in popularity. The nasolacrimal duct (NLD) may be injured inadvertantly or need to be removed during tumor resection or to augment visualization. Management of the NLD can take the form of transection alone, transection with stenting, or performing a formal dacryocystorhinostomy to avoid postoperative sequelae of injury. The purpose of this study was to review the literature and determine the optimal management of the NLD during expanded maxillary sinus approaches.

METHODS

A systematic review of Ovid, Embase, Medline, and Cochrane databases was performed to identify studies involving expanded approaches to the maxillary sinus and that explicitly reported the status of the NLD and postoperative outcomes.

RESULTS

Nineteen studies were included in the analysis and divided into two groups: NLD-preserving (n = 9 studies; n = 191 patients in aggregate) and NLD-involving (n = 10 studies; n = 296 patients in aggregate). In the NLD-preserving subgroup, one patient out of a subgroup aggregate of 191 patients (0.5%) developed epiphora. In the NLD-involving subgroup, sharp transection alone was the most common method of NLD removal and was associated with a low rate of epiphora (study rates: 0 to 18.2%; aggregated subgroup rate: 7.0%, 21 / 296). Spontaneous resolution of symptoms was common (60%-100% cases).

CONCLUSIONS

The NLD should be preserved when feasible from an exposure and tumor-control perspective. When pathology or approach requires the removal of the NLD, rates of persistent epiphora are very low, regardless of surgical technique. When expanded maxillary approaches are employed, particularly for benign tumors, and require removal of the NLD, sharp transection is the simplest method of removal, provides a low rate of postoperative epiphora, and is supported by the available literature.

Prelacrimal recess approach for maxillary sinus inverted papilloma: a 15-year experience from a single center

PURPOSE

This large retrospective, single-center, follow-up study investigated the endoscopic prelacrimal recess approach (PLRA) for treating maxillary sinus inverted papilloma (MSIP).

METHODS

Between January 2007 and November 2022, patients with MSIP treated with PLRA were enrolled. Data on clinical manifestations, imaging, and surgical procedures were collected. The visual analog scale (VAS) scores for maxillofacial numbness and nasal symptoms and the SNOT-22 nasal symptom scores were statistically analyzed.

RESULT

Of 122 patients (68 males and 54 females) enrolled in the study, with a mean age of 50.75 ± 12.84 years (26-80 years), 111 patients underwent PLRA, nine underwent modified PLRA, one converted to an endoscopic medial maxillectomy (EMM), and one to an endoscopic modified Denker's approach. The average follow-up was 86.60 (13-192) months, the recurrence rate was 3.28%, and 29 patients (23.77%) complained of maxillofacial numbness one month postoperatively, which disappeared in most cases one year after surgery. Five patients (4.10%) experienced mild numbness at the end of the follow-up period. Maxillary sinus ostium contracture or atresia occurred in two cases (1.64%). After surgery, the VAS nasal symptom scores improved significantly (P < 0.001). SNOT-22 indicated that the most common postoperative symptom was thick nasal discharge.

CONCLUSION

PLRA is a flexible first-choice surgical treatment for maxillary sinus inverted papilloma and can be modified according to the extent of the lesion, the surgeon's experience and technique, and surgical instruments. That can help achieve complete resection and reduce recurrence and surgical complications. Upper teeth numbness, the most common postoperative complication, tends to disappear after 1 year.

Utilizing radiomics for differential diagnosis of inverted papilloma and chronic rhinosinusitis with polyps based on unenhanced CT scans

To evaluate whether radiomics models based on unenhanced paranasal sinuses CT images could be a useful tool for differentiating inverted papilloma (IP) from chronic rhinosinusitis with polyps (CRSwNP). This retrospective study recruited 240 patients with CRSwNP and 106 patients with IP from three centers. 253 patients from Qilu Hospital were randomly divided into the training set (n = 151) and the internal validation set (n = 102) with a ratio of 6:4. 93 patients from the other two centers were used as the external validation set. The patients with the unilateral disease (n = 115) from Qilu Hospital were selected to further develop a subgroup analysis. Lesion segmentation was manually delineated in CT images. Least absolute shrinkage and selection operator algorithm was performed for feature reduction and selection. Decision tree, support vector machine, random forest, and adaptive boosting regressor were employed to establish the differential diagnosis models. 43 radiomic features were selected for modeling. Among the models, RF achieved the best results, with an AUC of 0.998, 0.943, and 0.934 in the training set, the internal validation set, and the external validation set, respectively. In the subgroup analysis, RF achieved an AUC of 0.999 in the training set and 0.963 in the internal validation set. The proposed radiomics models offered a non-invasion and accurate differential approach between IP and CRSwNP and has some significance in guiding clinicians determining the best treatment plans, as well as predicting the prognosis.

Management of frontal sinus and frontal recess inverted papilloma: our experience and systematic review

Objective

For frontal sinus inverted papilloma (FSIP) management, an endoscopic endonasal approach (EEA) can be combined (or not) with an external approach by an osteoplastic flap (OPF) or with a more conservative open approach. The present study aims to describe our experience in the management of FSIP, focusing on disease-related and anatomical features influencing outcomes and recurrence.

Methods

This case series of FSIP investigated anatomical and disease-related predictors of recurrence associated with EEA or a combined EEA-OPF approach. A systematic review was also performed, selecting publications on IP with the insertion point in the frontal sinus or frontal recess.

Results

Among 30 patients included, 18 underwent EEA, while 12 received a combined EEA-OPF approach. During a median follow-up of 37 months, the frontal sinus was cleared of IP in all cases except 2 in the EEA group, who presented a complex posterior wall shape of the frontal sinus. From the systematic review, a combined EEA-OPF approach was associated with a lower risk of recurrence.

Conclusions

A correct indication for a combined EEA-OPF approach is paramount and should integrate all disease-related and anatomical features, including posterior wall shape.

International Consensus Statement on Allergy and Rhinology: Sinonasal Tumors

BACKGROUND

Sinonasal neoplasms, whether benign and malignant, pose a significant challenge to clinicians and represent a model area for multidisciplinary collaboration in order to optimize patient care. The International Consensus Statement on Allergy and Rhinology: Sinonasal Tumors (ICSNT) aims to summarize the best available evidence and presents 48 thematic and histopathology-based topics spanning the field.

METHODS

In accordance with prior International Consensus Statement on Allergy and Rhinology documents, ICSNT assigned each topic as an Evidence-Based Review with Recommendations, Evidence-Based Review, and Literature Review based on the level of evidence. An international group of multidisciplinary author teams were assembled for the topic reviews using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses format, and completed sections underwent a thorough and iterative consensus-building process. The final document underwent rigorous synthesis and review prior to publication.

RESULTS

The ICSNT document consists of four major sections: general principles, benign neoplasms and lesions, malignant neoplasms, and quality of life and surveillance. It covers 48 conceptual and/or histopathology-based topics relevant to sinonasal neoplasms and masses. Topics with a high level of evidence provided specific recommendations, while other areas summarized the current state of evidence. A final section highlights research opportunities and future directions, contributing to advancing knowledge and community intervention.

CONCLUSION

As an embodiment of the multidisciplinary and collaborative model of care in sinonasal neoplasms and masses, ICSNT was designed as a comprehensive, international, and multidisciplinary collaborative endeavor. Its primary objective is to summarize the existing evidence in the field of sinonasal neoplasms and masses.

Classification of nasal polyps and inverted papillomas using CT-based radiomics

OBJECTIVES

Nasal polyp (NP) and inverted papilloma (IP) are two common types of nasal masses. And their differentiation is essential for determining optimal surgical strategies and predicting outcomes. Thus, we aimed to develop several radiomic models to differentiate them based on computed tomography (CT)-extracted radiomic features.

METHODS

A total of 296 patients with nasal polyps or papillomas were enrolled in our study. Radiomics features were extracted from non-contrast CT images. For feature selection, three methods including Boruta, random forest, and correlation coefficient were used. We choose three models, namely SVM, naive Bayes, and XGBoost, to perform binary classification on the selected features. And the data was validated with tenfold cross-validation. Then, the performance was assessed by receiver operator characteristic (ROC) curve and related parameters.

RESULTS

In this study, the performance ability of the models was in the following order: XGBoost > SVM > Naive Bayes. And the XGBoost model showed excellent AUC performance at 0.922, 0.9078, 0.9184, and 0.9141 under four conditions (no feature selection, Boruta, random forest, and correlation coefficient).

CONCLUSIONS

We demonstrated that CT-based radiomics plays a crucial role in distinguishing IP from NP. It can provide added diagnostic value by distinguishing benign nasal lesions and reducing the need for invasive diagnostic procedures and may play a vital role in guiding personalized treatment strategies and developing optimal therapies.

CRITICAL RELEVANCE STATEMENT

Based on the extraction of radiomic features of tumor regions from non-contrast CT, optimized by radiomics to achieve non-invasive classification of IP and NP which provide support for respective therapy of IP and NP.

KEY POINTS

• CT images are commonly used to diagnose IP and NP. • Radiomics excels in feature extraction and analysis. • CT-based radiomics can be applied to distinguish IP from NP. • Use multiple feature selection methods and classifier models. • Derived from real clinical cases with abundant data.

The Clinical Characteristics in Children with Sinonasal Inverted Papilloma: A Case Report and Review of the Literature

Sinonasal inverted papilloma (SNIP) is one of the most common benign epithelial tumors but rarely occurs in children. The case of a 9-year-old Chinese boy, who presented with a left maxillofacial hump, nasal obstruction, and left nasal cavity and maxillary sinus masses under nasal endoscopy, is reported. The lesion was first diagnosed as a sinonasal tumor. However, to our surprise, the mass was determined to be an inverted papilloma after a detailed histological examination. We retrospectively reported the clinical data of this case and reviewed the relevant literatures on SNIP. This report aims to provide new insights into the clinical characteristics in children with SNIP and improve the understanding of this disease.

Evaluation of inverted papilloma recurrence rates and factors associated recurrence after endoscopic surgical resection: a retrospective review

BACKGROUND

Sinonasal inverted papillomas (IP) are benign tumours arising from the mucosal lining of the nasal cavity and paranasal sinuses with a high propensity for recurrence and malignant transformation. Advances in endoscopic surgery and improved radiologic navigation have increased the role of endoscopic surgical resection in the treatment of IPs. The current study aims to evaluate the rate of IP recurrence after endoscopic endonasal resection and to evaluate factors which impact recurrence.

METHODS

This was a single-centre retrospective chart review of all patients who underwent endoscopic sinus surgery for management of IP between January 2009 and February 2022. Primary outcomes were the rate of IP recurrence and time to IP recurrence. Secondary outcome measures were patient and tumour factors that contributed to IP recurrence.

RESULTS

Eighty-five patients were included. The mean age was 55.7 and 36.5% of patients were female. The mean follow-up time was 39.5 months. Of the 85 cases, 13 cases (15.3%) had recurrence of their IP and the median time to recurrence was 22.0 months. All recurrent tumours recurred at the attachment site of the primary tumour. The univariate analysis did not identify any significant demographic, clinical, or surgical predictors of IP recurrence. There were no significant changes in sinonasal symptoms at the time IP recurrence was detected.

CONCLUSION

Endoscopic endonasal resection of IPs represents an effective surgical approach, however, the relatively high rate of recurrence and lack of symptomatic changes at the time of recurrence necessitates long term follow up. Better delineation of risk factors for recurrence can help identify high-risk patients and inform postoperative follow up strategies.

Development and Validation of a Clinical Prediction Model to Diagnose Sinonasal Inverted Papilloma Based on Computed Tomography Features and Clinical Characteristics

Objectives: Sinonasal inverted papilloma (SNIP) is one of the most common benign tumors of the nasal cavity and sinuses and is at risk for recurrence and malignant transformation. It is crucial to precisely predict SNIP before surgery to determine the optimal surgical technique and prevent SNIP recurrence. This study aimed to evaluate the diagnostic value of computed tomography (CT) features and SNIP clinical characteristics and to develop and validate a clinically effective nomogram. Methods: Here, 267 patients with SNIP and 273 with unilateral chronic rhinosinusitis with/without nasal polyps were included. Patient's demographic and clinical characteristics (i.e., gender, age, nasal symptoms, history of sinus surgery, smoking, and alcohol dependence) and CT features (i.e., lobulated/wavy edge, air sign, focal hyperostosis, diffuse hyperostosis, focal osseous erosion, and CT values) were recorded. Independent risk factors were screened using logistic regression analysis. A nomogram model was developed and validated. Results: Logistic regression analysis showed that age, facial pain/headache, history of sinus surgery, lobulated/wavy edge, air sign, focal hyperostosis, focal osseous erosion, and CT values were independent predictors of SNIP. A nomogram comprising these 8 independent risk factors was established. The area under the curve (AUC) for the training set was .960 (95% CI, .942-.978) and the AUC for the validation set was .951 (95% CI, .929-.971). Conclusion: The obtained results suggested that the nomogram based on age, facial pain/headache symptoms, history of sinus surgery, and CT characteristics had an excellent diagnostic value for SNIP.

A review of the revisions and complications management procedure in sinus surgery

One of the most standard and least invasive surgical procedures that could be applied mostly for the treatment of inflammation of the paranasal sinuses is endonasal endoscopic sinus surgery. The main objective of this study is to assess the available strategies for avoiding, diagnosis and also dealing with various kinds of potential complications of sinus disorders as well as the symptoms which specify the need for revision endoscopic sinus surgery mainly for the treatment of chronic rhinosinusitis. Based on the objectives of this study, the studies were categorized within four main groups; sinus disorders, diagnosis, management, and treatment. In this regard, wide research has been done in various scientific databases of PubMed, EMBASE, Europe PMC, HubMed, MEDLINE, Scientific Information Database (SID) and Google Scholar. From a total of 315 founded records, the final number of 91 records were reviewed. The rate of complication associated with endoscopic sinus surgery is not much and the improvement of surgical technology and experience could decrease its side effects. Performing immediate extensive surgery among patients who have inflammatory sinonasal disease could modify long-term consequences. Applying endoscopic sinus surgery could yield the most appropriate positive outcomes. For achieving the most suitable surgical consequences, the surgeon should be adequately qualified in diagnosis and facing with any possible complications during the operation in addition to cases with complex and revision problems.

NGS-based miRNome identifies miR-449 cluster as marker of malignant transformation of sinonasal inverted papilloma

OBJECTIVE

identification of the miRNA expression profile in sinonasal inverted papilloma (SNIP) as a tool to evaluate the risk of transformation into sinonasal squamous cell carcinoma (SNSCC).

MATERIALS AND METHODS

paired tumour tissues and adjacent normal tissues were obtained from SNIP and SNSCC patients who had undergone surgical resection and used for next-generation sequencing (NGS)-based miRNome analysis. SNIP tissues with concomitant dysplasia (SNIP-DISP) were used as malignant transition samples. By comparing the deregulated miRNAs in SNIP and SNSCC, an miRNA cluster was identified and its physio- and clinical-pathological value was predicted.

RESULTS

NGS identified 54 miRNAs significantly down- and upregulated in SNIP. Among them, the miR-449 cluster was upregulated in SNIP and could differentiate the benign tumour from normal tissue. Notably, the miR-449 cluster was found to be significantly underexpressed in SNSCC, and the cluster markedly changed in SNIP during the malignant transition into SNSCC. miRNA enrichment analysis and GO analysis revealed that miR-449 is involved in apoptotic and cell proliferation pathways.

CONCLUSIONS

Our findings suggest that miR-449 may be involved in the molecular pathogenesis of SNIP and its malignant transformation into SNSCC. miR-449 might therefore be a useful tumour biomarker in patients with SNIP and may also have the potential to be used as a tool for detecting and monitoring the course of the possible malignant transformation.

Is intraoperative margin sampling necessary in inverted papilloma resection?

PURPOSE

To explore the association between intraoperative surgical margin sampling by the frozen sections and recurrence in inverted papilloma surgery.

METHODS

A multicenter, retrospective study of patients who underwent attachment-oriented IP resection in four tertiary care medical centers with a minimal follow-up of 36 months.

RESULTS

The study included 220 surgeries with a mean follow-up period of 49 months (range 36-204). The endoscopic approach was used in all but 4 cases; 73% of procedures were primary. Overall recurrence was 10.45% (n = 23). Squamous cell carcinoma was found in 5 cases (2.2%). Intraoperative margin sampling was obtained in 145 cases. There was no difference in the recurrence rate between frozen section and no-frozen section groups (p = 0.44). Furthermore, margin sampling in various sites of tumor origin, in cases with concomitant nasal polyps (p = 0.53) and in revision cases (p = 0.08) showed no correlation with recurrence. In 26 cases when the surgery was extended following a positive frozen section, there was a significantly higher recurrence rate (OR = 6.94).

CONCLUSIONS

According to our results, intraoperative margin sampling did not affect the recurrence rate of IP, and therefore, its routine use should be questioned.

Above and Beyond: Periorbital Suspension for Endoscopic Access to Difficult Frontal Sinus Pathology

OBJECTIVES/HYPOTHESIS

The periorbital suspension (PS) is an advanced adjunctive technique performed during endoscopic approaches to frontal sinus pathology that would be too far lateral or superior to address using traditional endoscopic transnasal approaches. The objectives of this study are to characterize the utility of this technique for frontal sinus pathology, determine anatomic limitations, and assess clinical outcomes following surgical treatment.

STUDY DESIGN

Prospective case series.

METHODS

Patient data including demographics, etiology, technique, complications, and clinical follow-up were collected. Preoperative computed tomography scans were reviewed for maximum lateral and superior extent of pathology, supraorbital recess height, anterio-posterior (AP) diameter of the frontal sinus, interorbital distance, and orbital-first olfactory neuron distance.

RESULTS

The PS approach was used in 30 surgeries (29 patients) for cerebrospinal fluid leaks (n = 5), benign tumors (n = 17), malignant tumors (n = 5), allergic fungal sinusitis (n = 2), and mucocele (n = 1) between 2018 and 2020. Approaches included 15 Draf IIB and 15 Draf III frontal sinusotomies. All pathology was surgically accessible using the PS approach and there were no intraoperative or postoperative complications. Postoperative follow-up was 11.7 ± 7.6 months. Mean recorded measurements (in mm) were as follows: maximum lateral extent -15.0 ± 7.7, superior extent 21.2 ± 7.7 in surgical plane and 20.9 ± 9.8 in the vertical plane, supraorbital recess height -2.6 ± 1.9, AP frontal sinus diameter -13.2 ± 4.7, interorbital distance -29.8 ± 5.4, and orbital-olfactory neuron distance -14.8 ± 2.9.

CONCLUSIONS

The PS technique can be safely and successfully utilized to provide endoscopic endonasal access to lateral and superior frontal sinus pathology.

LEVEL OF EVIDENCE

4 Laryngoscope, 2021.

Outcomes of sinonasal oncocytic papilloma by endoscopic approach in 69 patients

OBJECTIVE

Sinonasal oncocytic papilloma (SOP) is a rare subtype of sinonasal papilloma. There are currently few reports on its clinical features and outcomes after endoscopic surgical resection. This study aims to explore the clinical characteristics of SOP and potential factors predicting tumor recurrence through a single-center retrospective case series analysis.

METHODS

We conducted a retrospective analysis of 69 patients who underwent endoscopic surgery of SOP from June 2012 to April 2019. The data of patients' demographics, clinical features, follow-up period, and treatment outcomes were collected.

RESULTS

The series includes 43 males and 26 females with an average age of 60.2 years. The tumor commonly involved the nasal cavity (n = 59; 89.4%), followed by maxillary sinus (n = 31; 44.9%), ethmoid sinus (n = 28; 40.6%), frontal sinus (n = 6; 8.7%) and sphenoid sinus (n = 6; 8.7%). The follow-up period ranged from 3 months to 96 months (mean, 34.6 months) and nine patients (13%) developed tumor recurrence during the follow-up period. Univariate analysis found that the recurrence of SOP was significantly related to tumor attachment site, Oikawa tumor stage, and histological dysplasia (p<0.05). Multivariate COX regression analysis found that Oikawa staging system (p = 0.024) and presence of dysplasia (p = 0.04) were significantly related to tumor recurrence.

CONCLUSION

SOP had low recurrence rate which was comparable to sinonasal inverted papilloma in the endoscopic era. Our findings also demonstrated that presence of dysplasia is an independent prognostic factor for recurrence free survival.

Rare Diseases of the Nose, the Paranasal Sinuses, and the Anterior Skull Base

Due to their low incidence and thus resulting limited diagnostic criteria as well as therapeutic options, rare diseases of the nose, the paranasal sinuses, and the anterior skull base are a significant challenge. The value as of which a disease has to be considered as rare amounts to a maximum of 5 patients per 10 000 people. Within these diseases, however, there are extreme differences. Some rare or orphan diseases like for example the inverted papilloma belong to regularly diagnosed and treated diseases of larger departments of oto-rhino-laryngology whereas other rare diseases and malformations have only been described in less than 100 case reports worldwide. This fact emphasizes the necessity of bundling the available experience of diagnostics and therapy. The present article gives an overview about rare diseases of the nose, the paranasal sinuses, and the anterior skull base from the field of diseases/syndromes of the olfactory system, malformations of the nose and paranasal sinuses, ventilation and functional disorders as well as benign and malignant tumors. The classification and data on diagnostic and therapeutic options were established based on the current literature.

High CT values relative to the brainstem differentiate inverted papillomas from nasal polyps

OBJECTIVES

A diagnostic indicator for the differentiation of inverted papillomas (IPs) from inflammatory nasal polyps (NPs) has not been established. This study aimed to evaluate whether CT attenuation values relative to those of the brainstem (relative CT number) could be useful for differentiating IPs from NPs.

MATERIAL AND METHODS

Consecutive patients who were pathologically diagnosed with IP or NP between 2005 and 2019 were retrospectively identified. Relative CT numbers were compared between the two patient groups. The factors with predictive power for differentiating IPs from NPs were identified by univariate and multivariate logistic regression analyses.

RESULTS

One hundred and twenty-two sinonasal masses were finally analysed (IP, 51 cases; NP, 71 cases). Relative CT numbers were significantly higher in IP than in NP (P < 0.001). Univariate logistic regression analysis showed relative CT number, bone erosion and bone thickening to have predictive value for differentiating IPs from NPs (relative CT number, P < 0.001; bone erosion, p = 0.04; bone thickening, P < 0.001). In the multivariate logistic regression analysis, relative CT number and bone thickening had predictive value for distinguishing IP from NP (relative CT number, p < 0.001; bone thickening, p = 0.02). The optimum cut off value calculation from the area under the receiver operating characteristics curve indicated that a relative CT number >1.3 was significantly associated with IP (sensitivity, 72.6%; specificity, 87.3%). Within cases not showing bone thickening, only the relative CT number was a predictive factor for differentiating IPs from NPs in the univariate analysis.

CONCLUSIONS

High relative CT numbers could potentially indicate IP, and their measurement could provide a basis for differentiating IPs from NPs.

Assessment of Lacrimal Duct Patency in Patients Undergoing Endoscopic Medial Maxillectomy

Purpose: The risk of epiphora after medial maxillectomy with lacrimal duct transection is difficult to assess. The data available in the literature are inconclusive due to various operating techniques used by the authors of medical publications, different additional procedures aimed at improving tear drainage after maxillectomy, and a variety of lacrimal duct patency assessment techniques. The aim of our work was to assess the anatomical and functional patency of lacrimal ducts after medial maxillectomy without performing additional procedures to improve tear drainage as well as comparison of the results obtained with different assessment tests. Materials and methods: 21 patients who underwent medial maxillectomy in the years 2016–2019 were assessed for discomfort and epiphora based on patients’ own reports and basic clinical examination, lacrimal duct rinse test, the Munk score, and a modified endoscopic Jones I test. Results: Gradually increasing the sensitivity of the assessment method resulted in an increase in the number of patients with potential tear drainage disorders, starting from 0% in the rinsing test, 4.8% self-reported tearing complaints, 14.3% Munk score, and 19% modified endoscopic Jones I test. Conclusions: The study results revealed that a small fraction of patients tend to report epiphora as a consequence of medial maxillectomy themselves. Subtle functional disorders, which are not particularly bothersome to patients, are more common. More sensitive lacrimal duct patency tests reveal more cases of tear drainage disorders. The results of studies assessing the incidence of epiphora after medial maxillectomy appear to depend on the type of test used.

Need for long-term follow-up in sinonasal inverted papilloma: A Single-institution experience

BACKGROUND

Most studies on sinonasal inverted papillomas (SNIPs) regarding risk factors for recurrence, recurrence rates (RRs) and malignant transformation are biased by a significant proportion of revision cases.

METHODS

Retrospective study on patients with consecutive, treatment-naïve SNIPs at a tertiary referral center between 1999 and 2019.

RESULTS

Overall, RR was 9.8% (10 of 102 patients), with 2 of 10 recurrences (20%) occurring after more than 5 years. Histopathological workup revealed synchronous malignancy in 2 of 102 patients (2%). Subgroup analysis revealed a significantly higher RR for SNIPs involving the frontal sinus (26.3% vs 6.0%, P = .02). No SNIPs primarily originating from the frontal sinus were observed.

CONCLUSION

Overall, RR of treatment-naïve SNIPs is comparably low; however, long-term follow-up is mandatory due to late recurrences. Secondary involvement of the frontal sinus was identified as risk factor for recurrence. No SNIPs primarily originating from frontal sinus were observed.

Sinonasal papillomas: A single centre experience on 137 cases with emphasis on malignant transformation and EGFR/KRAS status in "carcinoma ex papilloma"

Among the three major histological subtypes of sinonasal papillomas, inverted (ISP) and oncocytic (OSP) sinonasal papillomas tend to undergo malignant transformation to carcinoma. However, criteria determining risk of recurrence and malignant progression have not been established. Recently, EGFR and KRAS mutations were detected to be characteristic for ISP and OSP, respectively. In this study, we analyzed 137 sinonasal papilloma cases (132 ISP and 5 OSP) for clinicopathological characteristics, frequency of recurrences/malignant transformation, and histological types and genetic features of carcinoma ex Schneiderian papilloma. OSP presented at a higher age than ISP (median, 75 vs. 57 years) and affected predominantly females. Overall frequency of recurrences and malignant transformation was 23.1% and 9.5%, respectively. Rates of recurrence (33.3% vs. 22.0%) and malignant transformation (33.3% vs. 8.8%) were higher in OSP compared to ISP, respectively. Carcinomas (n = 10) occurred mostly synchronously, more frequently in females and mainly associated with ISP (n = 9). Squamous cell carcinoma (SCC) was the most frequently associated malignancy. Concordant EGFR (in ISP/associated carcinoma) and KRAS (in the OSP/associated carcinoma) mutations were detected in all successfully analyzed matching papilloma/carcinoma pairs, confirming their shared clonal origin. Results of this large study are in line with recent studies showing frequent EGFR and KRAS mutations in sinonasal carcinoma ex Schneiderian papilloma. As the papilloma component might on occasion be missed on biopsy of synchronous carcinoma ex papilloma, EGFR and KRAS mutation testing represents a promising molecular surrogate for sinonasal "carcinoma ex papilloma", at the same time offering an opportunity for targeting mutant EGFR in this rare cancer type.

How aggressive should resection of inverted papilloma be? Refinement of surgical planning based on the 25-year experience of a single tertiary center

BACKGROUND

The technique for transnasal endoscopic resection of inverted papilloma (IP) has evolved considerably during the last 20 years. The aim of the present study is to retrospectively analyze a single tertiary center series, with special emphasis on assessing the value of an "insertion-driven" technique on local control.

METHODS

Patients undergoing endoscopic resection for IP at the University of Brescia during the period 1991 to 2015 were enrolled. Site of origin and extension of IPs were assessed, together with presence of dysplasia and carcinoma in situ. Patients were divided in 3 cohorts: (1) historical cohort (treated before 2008), (2) contemporary "centripetal" cohort (treated with a traditional technique after 2008), and (3) contemporary "insertion-driven" cohort (treated with insertion-driven resection). Groups were compared considering outcomes and complications.

RESULTS

The series included 210 patients. Mean follow-up was 77.8 months. Thirty-eight (18.1%) patients showed precancerous changes. Maxillary involvement (p = 0.021) and presence of precancerous changes (p = 0.013) were significantly associated with a higher risk of recurrence. Five-year local control rate before and after 2008 was 95.1% and 90.5%, respectively. The insertion-driven cohort was associated with lower disease control when IPs involved the maxillary sinus. The rate of complications was 11.9%. The insertion-driven cohort was associated with a lower rate of major complications (p = 0.098).

CONCLUSION

Preoperative evidence of precancerous changes and/or involvement of maxillary sinus should prompt the surgeon to address the disease more aggressively (centripetal resection). Preoperative imaging and biopsy with abundant material may optimize the chance to stratify patients eligible for less or more conservative approaches.

Transpalpebral Frontal Sinus Septectomy: Feasibility and Results

Background

Transpalpebral frontal septectomy (TFS) can be performed for unilateral frontal sinusitis drainage (into the contralateral healthy frontal sinus) or to provide access to the lateral extent of the contralateral frontal sinus. This procedure has demonstrated its usefulness in several problematic situations for the endoscopic surgeon.

Objective

The main objective of our study was to evaluate the feasibility of TFS. Secondary objectives were to define outcomes, early and late complications, contraindications, and failure rates of the TFS.

Methods

We reviewed patient demographics including age and gender, indication for frontal septectomy, prior surgeries, failure rates and necessity of revision surgery, early and late complications, and the side of the approach (ipsi- or contralateral to the frontal sinus pathology). Twenty patients who had undergone TFS were included. Patients were classified into 2 groups according to the surgical indication: group 1—TFS performed for unilateral frontal sinusitis to drain a frontal sinus in the contralateral frontal sinus; and group 2—TFS performed to provide access to the lateral extent of the contralateral frontal sinus. Scarring was assessed using the SCAR-Q questionnaire.

Results

TFS was performed on all patients in Groups 1 and 2 (success rate = 100%). No patients had recurrence of the pathology 6 months after surgery (0%). No patient needed revision surgery (0%). One complication (frontal hypoesthesia) was reported 6 months after surgery. Mean SCAR-Q score was 99.3 ± 2.5 (min = 91/100, max = 100/100).

Conclusion

TFS was feasible for all patients in this study. This procedure permits drainage of the frontal sinus and gives access to the lateral extent of the contralateral frontal sinus, without visible scarring, and with few lasting complications. Authorization to conduct this study was obtained from the Ethical Committee of our institution (APHM, n°2019_65).

Clinical outcome of endonasal endoscopic prelacrimal approach in managing different maxillary pathologies

Background

The aim of the study was to evaluate the treatment outcomes of endoscopic prelacrimal recess approaches (EPLAs) in managing different sinus pathologies, analyzing associated adverse events and post-treatment quality-of-life.

Methods

We enrolled 21 consecutive patients (22 lesions) who received endoscopic sinus surgical procedures with EPLAs in two tertiary medical institutes between 2015 and 2018. Quality-of-life and self-rated symptom severity data were collected using the 22-item Sino-Nasal Outcomes Test (SNOT-22) and 10-point visual analog scales (VAS), respectively.

Results

A total of 21 patients (mean age (standard deviation) 51.7 (14.5) years; 16(76.2%) male) were followed up for 12.7 months. The most common symptoms were nasal discharge and nasal airway obstructions. Nine lesions (40.9%) were sinonasal papilloma's, seven lesions were other types of neoplasms (31.8%; five benign and two malignant), two were trauma-related (9.1%), and four inflammatory diseases (18.2%). Patients with non-papilloma lesions had higher presurgical SNOT-22 than those with papillomas (P-value = 0.021). After EPLAs, non-papilloma patients had significant improvements in SNOT-22 and VAS (P-values = 0.012 and 0.012, respectively), while those with papillomas had only marginally significant improvements in VAS (P-value = 0.061). The most common adverse events was temporary cheek/tooth numbness (n = 11), and patients with sinonasal papillomas were more likely to have post-treatment complications than those with other disease entities.

Conclusions

EPLAs were found to effectively manage various sinus diseases. Short-term life-quality improvements were promising. Future large-scale studies with longer follow-up periods are recommended.

Resection of inverted papilloma in nasal cavity with transseptal access and crossing multiple incisions minimizes bleeding and reveals the tumor pedicle

OBJECTIVE

Sinonasal inverted papilloma can be resected endoscopically, but has a risk of recurrence. This risk can be minimized by identifying the pedicle of the tumor and ensuring complete resection. Intraoperative bleeding, particularly from the tumor, decreases endoscopic visualization and contributes to failure to identify the tumor pedicle, and piecemeal resection with dissection of the non-tumoral mucosa makes it impossible to distinguish the tumor pedicle. Previously reported transseptal access with crossing multiple incisions (TACMI) increases mobility of an inverted papilloma within the otherwise restricted nasal cavity. This technique often allows en bloc resection complete with the pedicle and control of bleeding.

METHODS

We retrospectively reviewed our patients who underwent endoscopic resection of inverted papilloma with or without TACMI and compared the operating times, estimated blood loss, and en bloc resection and recurrence rates between the two groups.

RESULTS

Thirty-five patients underwent endoscopic resection of inverted papilloma (Krouse stage 2-4) with (n = 23) or without (n = 12) TACMI. The operating time was longer in the TACMI group (218±68 min) than in the non-TACMI group (129±33 min). Estimated blood loss was less in the TACMI group (72±103 mL vs. 120±136.5 mL) but this finding was not significant. En bloc resection was achieved in 19 patients (83%) in the TACMI group but not in any patient in the non-TACMI group. There were no recurrences in the TACMI group. Multivariate analysis showed significant relationships between estimated amount of blood loss and operating time according to Krouse stage and whether or not TACMI was performed.

CONCLUSIONS

Endoscopic resection of inverted papilloma with TACMI may achieve better treatment results with less blood loss.

Surgery of Inverted Papilloma of the Maxillary Sinus via Translacrimal Approach-Long-Term Outcome and Literature Review

There are several differential diagnoses of unilateral sinus disease. One of these is inverted papilloma (IP) of the maxillary sinus, which is a common benign tumor with a substantial rate of malignant transformation. In general, endoscopic endonasal techniques for addressing the tumor are favored nowadays instead of classical external approaches. The aim of this retrospective study was to investigate the long-term outcome of inverted papilloma treated endoscopically via the prelacrimal approach. We reviewed 17 patients with primary or recurrent IP of the maxillary sinus that were treated via the prelacrimal endoscopic endonasal technique. After a median follow-up period of 45.9 months (3.8 years), none of the 17 included patients showed signs of recurrent disease and no serious complications were reported. Hypoesthesia of the incisors was reported by four patients and was resolved with time in one. All of the maxillary sinuses could be fully visualized with the flexible endoscope. IP is an important differential diagnosis in the clinical finding of unilateral nasal polypoid lesions. The prelacrimal approach is an effective and safe method in the treatment of IP with limited patient morbidity.

Surgical management of inverted papilloma involving the frontal sinus: a practical algorithm for treatment planning

Inverted papilloma of the frontal sinus is a challenging disease. Given its rarity, only small case series are present in the literature. The objectives of the present study are to review our experience in the surgical management of inverted papillomas involving the frontal sinus and to propose a practical algorithm for selecting the most appropriate approach. Data on patients affected by inverted papilloma involving the frontal sinus and surgically treated between 2002 and 2016 were collected. The type of involvement of frontal sinus and extent of surgery performed (endoscopic endonasal, external or combined approaches) were analysed. A brief review of consistent literature was also carried out. Forty-seven consecutive patients were treated using an exclusive endoscopic endonasal approach (EEA) in 18 cases, while a combined endonasal with external osteoplastic approach was required in 29 cases. Most patients (29/47, 62%) had been treated previously, mainly by an endoscopic approach. A single intraoperative complication occurred (1/47, 2%), i.e. cerebrospinal fluid (CSF) leak, that was successfully repaired intraoperatively without any consequences. Recurrences were observed in only 2/47 cases (4%) after a mean follow-up of 43 months (range, 12-137). The management of inverted papilloma involving the frontal sinus requires great expertise and the surgical technique should be tailored to the site of attachment of the tumour, its extension and the anatomical conformation of each frontal sinus. The encouraging results obtained in this case series support the use of this practical treatment algorithm.

Sinonasal Oncocytic Papilloma-A Series of 20 Cases With Special Emphasis on Recurrences

Objective

Reports on sinonasal oncocytic papilloma (SNOP) are scarce. The aim of this retrospective study was to evaluate the clinical features of this rarest form of sinonasal papilloma with special emphasis on the pattern of recurrences and on the potential factors predicting them.

Study Design

Retrospective study.

Methods

Between the years 1994 and 2016, 20 patients (mean age 66 years; range 30–87) were diagnosed with SNOP at the Department of Otorhinolaryngology–Head and Neck Surgery, HUS Helsinki University Hospital (Helsinki, Finland). Hospital charts were reviewed to record various medical and sociodemographic patient characteristics, and the archived histological specimens were re‐evaluated. Postoperative follow‐up time varied between 26 days and 167 months.

Results

Maxillary sinus was the most common (60%) tumor location. None of the tissue samples showed dysplasia. Recurrence rate was 39% and the median time span to the first recurrence was 25 months (range 7–71). Smokers had more often a recurrence than nonsmokers (75% vs. 31%). Patients with perioperative purulent rhinosinusitis during the primary surgery had a higher recurrence rate compared with those without (60% vs. 31%). Tumors located in the sinuses recurred more often than those located in the nasal cavity (45% vs. 29%). However, all these findings remained statistically nonsignificant. None of the cases showed malignant transformation during the follow‐up.

Conclusion

SNOP has a propensity to recur. History of smoking, purulent rhinosinusitis during the primary surgery, and tumor location in the sinuses outside the nasal cavity seem to contribute to an increased trend in the risk of recurrence.

Level of Evidence

4

Frontal inverted papillomas: A 25-year study

Objectives/Hypothesis

This study analyzes the treatment outcomes of frontal inverted papillomas (FIPs) in an attempt to provide guidelines for surgery selection.

Study Design

Retrospective case series.

Methods

The treatment results of 29 FIPs classified into five categories were retrospectively analyzed. The five categories are F1, tumor prolapsed into frontal sinus, tumor origin outside frontal sinus; F2, tumor origin inside frontal sinus, medial to the plane of lamina papyracea; F3, tumor origin inside frontal sinus, lateral to the plane of lamina papyracea; F4, bilateral; and F5, extrasinonasal.

Results

Of the 11 F1 cases, 73% had Draf I and 27% had Draf IIA procedures. There was one (9%) frontal recurrence and one (9%) frontal stenosis. Of the 10 F2 cases, 10% had Draf I, 40% had Draf IIA, 40% had Draf IIB, and 10% had Draf III surgery with a trephination. One patient (10%) had a frontal recurrence. Of the five F3 cases, 40% had Draf IIA surgery, 20% had external frontoethmoidectomy, and 40% had external frontal sinusotomy. The recurrence rate was 60%, and frontal stenosis rate was 60%. The two F4 cases had external frontal sinusotomies and Draf III surgery with no frontal recurrence or stenosis. The patient with the F5 had a frontal recurrence after Draf IIA surgery and external frontoethmoidectomy.

Conclusions

Draf I or IIA surgery is adequate for most F1 tumors, and Draf II surgery is adequate for most F2 tumors. F3 and F4 tumors can be managed initially by Draf III surgery with external frontal sinusotomy added when required. F5 tumors probably require combined surgical approaches.

Level of Evidence

4 Laryngoscope, 130:1622–1628, 2020

Nasolacrimal Duct Management During Endoscopic Sinus and Skull Base Surgery

OBJECTIVE

To evaluate rates of epiphora after transection and marsupialization of the nasolacrimal duct (NLD) during endoscopic sinus and skull base surgery.

INTRODUCTION

The nasolacrimal canal forms part of the medial wall of the maxillary sinus. Transecting the NLD is sometimes necessary for tumor resection or surgical access to maxillary sinus and infratemporal fossa pathology. There is no consensus for the endoscopic management of the NLD when only the duct is transected without involving the nasolacrimal sac.

METHODS

Medical records of 29 patients from 2 academic institutions who underwent endoscopic sinus and skull base surgery with transection of the NLD were retrospectively reviewed. Whether the duct was marsupialized or simply transected was recorded, and the postoperative rate of epiphora was calculated.

RESULTS

Mean age was 59 years (range, 14-86 years). Mean follow-up was 10.5 months (range, 1-33 months). The NLD was marsupialized in 16 (55%) and simply transected in 13 (45%) patients. Six patients underwent postoperative radiation. No patients in the marsupialization group had epiphora postoperatively, all with Munk score of 0. One patient in the transection group developed postoperative epiphora with Munk score of 1. Pathology included inverted papilloma (8), acute on chronic inflammation (6), B-cell lymphoma (3), juvenile nasopharyngeal angiofibroma (2), squamous cell carcinoma (2), Schneiderian papilloma (2), metastatic melanoma (1), HPV-related carcinoma (1), adenocarcinoma (1), benign epithelial cyst (1), adenoid cystic carcinoma (1), and erosive chronic sinusitis without nasal polyposis (1).

CONCLUSION

Management after transection of the NLD varies widely. The duct may be simply transected or marsupialized, or a formal dacryocystorhinostomy can be performed. The surgeon must also choose whether to place a stent. Based on our small series and review of the literature, marsupialization or simple transection of the NLD results in a low rate of postoperative epiphora in the setting of endoscopic sinus and skull base surgery.

Attachment-oriented endoscopic surgical management for inverted papillomas in the nasal cavity and paranasal sinuses

OBJECTIVE

The treatment of all forms of sinonasal inverted papilloma (IP) is a complete, wide, local resection. The main surgical purpose is to remove all diseased mucosa and mucoperiosteum, together with a cuff of normal-looking mucosa at the attachment site, followed by drilling and/or coagulation. Our aim is to present our experiences in endoscopic surgical management of IP by using attachment-oriented excision.

METHODS

We present 20 cases of sinonasal IP. The data collected includes the histopathological diagnosis, staging, extension of the tumor, tumor attachment site, approach to surgery, serum squamous cell carcinoma antigen (SCCA) level, and recurrences.

RESULTS

All patients underwent endoscopic surgery. A Caldwell-Luc operation was required in addition to the endoscopic surgery in one case. There was one case of recurrence (5%). After the additional operation, there was no recurrence. The tumor attachment sites vary, and the case of recurrence had a wide attachment site at the primary surgery. No major intra- or post-operative complications were observed.

CONCLUSION

The present study shows that attachment-oriented excision for IP is useful for complete resection of IP. Surgeons should choose the surgical approach according to the location of the tumor attachment site rather than the Krouse staging system.

Surgical outcomes of sinonasal inverted papilloma: a 17 year review

Introduction

Inverted papillomas represent one of the most common benign neoplasic lesions located in the sinonasal tract. Owing to the local erosive behavior, tendency to recur and the potential for malignant transformation, surgical management of inverted papillomas is often challenging.

Objective

This study aimed to analyze the surgical outcomes of patients with inverted papillomas, according to the Krouse staging and the different surgical approaches.

Methods

Retrospective study of patients diagnosed with sinonasal inverted papillomas who underwent surgical treatment between 2000 and 2016 at a tertiary referral hospital. Cases with follow-up less than 12 months were excluded. The rate and the time of recurrence were the main outcomes. Values of p < 0.05 were considered statistically significant.

Results

Thirty-six cases with mean age of 60 years, predominantly male (72%), were included. The follow-up period ranged from 1 to 16 years, with an average of 4.5 years. Krouse T1 Stage corresponded to 11.1%; T2 occurred in 50% of cases; while T3 and T4 Stages accounted for 30.6% and 8.3% of patients, respectively. Most cases were approached by an endoscopic technique alone (83.3%), with a recurrence rate of 13.3%. Patients treated via a combined or open approach revealed a recurrence of 16.7%. No differences in the recurrence rate were reported when comparing endoscopic surgery with the open or combined techniques. Krouse Stage T3 had a significant association with inverted papillomas recurrence (p = 0.023). All inverted papilloma relapses occurred up to 2 years post-operatively. One case of malignant transformation was recorded (2.7%).

Conclusion

Endoscopic surgery did not increase the recurrence rates and can be a safe and efficient alternative to open or combined techniques. The recurrence of inverted papillomas seem to be related to the persistence of the disease and tend to occur early after primary surgery. Krouse T3 Stages may be associated with a higher recurrence of inverted papillomas.

Resection of Inverted Papilloma of the Maxillary Sinus via a Prelacrimal Recess Approach: A Multicenter Retrospective Analysis of Surgical Efficacy

BACKGROUND

The intranasal endoscopic prelacrimal recess approach (PLRA) access to all aspects of the maxillary sinus while preserving the inferior turbinate and nasolacrimal duct and its use have been reported in the treatment of many maxillary sinus and lateral skull base diseases.

OBJECTIVE

To retrospectively assess the effectiveness of a 10-year multicenter follow-up for the resection of inverted papilloma of the maxillary sinus (IPMS) via a PLRA.

METHODS

A total of 71 patients were admitted and underwent IPMS excision via an intranasal endoscopic PLRA from 2003 to 2013. All patients underwent high-resolution computed tomography scanning of the nasal sinus, and some also underwent magnetic resonance imaging examination.

RESULTS

Based on the Krouse staging system, all 71 patients belong to T3 staging. The PLRA was employed to remove IPMS in 71 patients. The postoperative pathological examination of the excised tissue revealed inverted papilloma, and cancerization was identified in 3 patients. The median follow-up time was 37.3 months (range: 13-134 months). Of the 71 patients, reoccurrence was seen in 5 patients (7.04%); 5 patients (7.04%) experienced numbness of the upper lid and the ala of the nose and 4 (5.63%) experienced mild collapse of the ala of the nose.

CONCLUSIONS

These multicenter follow-up results demonstrated that the PLRA is a safe and effective method for the excision of primary or recurrent IPMS with lower postoperative complications and recurrent rate.

Endoscopic Resection of Sinonasal Inverted Papilloma: Systematic Review and Meta-Analysis

Background Pure endoscopic surgery (functional endoscopic sinus surgery) has been increasingly replacing external approaches in the management of sinonasal inverted papillomas. Objective To analyze and compare the effectiveness of pure endoscopic procedure with external or combined procedures to paranasal inverted papillomas, including the experience from two institutions in North Greece, over a 20-year period. Methods Systematic literature searches of MEDLINE (1952-2016), EMBASE (1974-2016), and the Cochrane Central Register of Controlled Trials. Review of all English-language studies comparing endoscopic and open techniques. Odds ratios (ORs), risk ratio, 95% confidence intervals (CIs), and tests for heterogeneity were reported. Recurrence rates according to initial tumor stage. Results In total, 2451 patients had been enrolled in the 23 studies, published between 1992 and 2014. All the included articles are graded as level IV evidence. Among the 1526 patients of the endoscopic group, 212 (13.8%) had recurrence, with the mean time of recurrence to range from 14 to 46.6 months. In the external approach group, 111 (18.7%) of the 592 patients had recurrence, with the time of recurrence to range from 7 to 92 months. The recurrence rate in the combined approach group was 12.9%. The occurrence rate of recurrence attributable to the surgical choice was significantly different between endoscopic and external group (OR: 0.61; 95% CI: 0.40-0.92; P = 0.02; 14.9% vs. 18.8% in endoscopic and external group, respectively). Conclusions The present systematic review and meta-analysis indicates that endoscopic approach seems a favorable treatment option of sinonasal inverted papillomas and confirms the global recommendation that is the gold standard in the treatment of such nose lesions, revealing a lower recurrence rate compared to external approaches.

Better surgical outcome by image-guided navigation system in endoscopic removal of sinonasal inverted papilloma

PURPOSE

The purpose of this study was to validate and compare treatment outcomes for endoscopic resection of sinonasal inverted papilloma (IP) with or without the use of a navigation system.

MATERIALS AND METHODS

A total of 58 patients who underwent endoscopic resection of sinonasal inverted papilloma by a single surgeon from 2007 to 2016 at our institution were retrospectively reviewed. Depending on the use of the navigation system, subjects were divided into two groups: a conventional endoscopic resection group without navigation system (CER group) and a navigation-assisted endoscopic resection group (NER group).

RESULTS

There were 24 patients (41.4%) in the CER group and 34 patients (58.6%) in the NER group. Treatment outcomes showed that navigation-assisted endoscopic resection was a more beneficial surgical technique than conventional endoscopic resection for sinonasal IP. Post-surgical recurrence was noted in seven cases (29.2%) in the CER group and two cases (5.9%) in the NER group. Accordingly, the recurrence rate was significantly less in the NER group compared to the CER group (p = 0.026). There were two cases of complications (8.3%) in the CER group comprising cerebrospinal fluid leak and periorbital fat exposure, while no complications were noted for the NER group (p = 0.167).

CONCLUSION

This study demonstrated that navigation-assisted endoscopic removal of sinonasal IP is helpful for reducing recurrence and avoiding surgical complications. Therefore, navigation systems should be always considered when performing endoscopic removal of sinonasal IP.

Surgical management of inverted papilloma; a single-center analysis of 247 patients with long follow-up

BACKGROUND

Our aim was to review our management of inverted papilloma (IP), perform a recurrence analysis, and review the literature.

METHODS

A retrospective analysis of 247 patients treated for an IP. Patients were grouped according to surgical approach, tumor presentation (primary, residual and recurrence) and Krouse-stage.

RESULTS

Recurrence was observed in 20.3%, 28.6% and 35.1% (p = 0.017) of the patients who underwent endoscopic, external and combined surgery, respectively. Recurrences occurred more often in residual than primary IP (36.9% vs. 22.3%, p = 0.021). Primary endoscopic surgery had a recurrence rate of 12.5%, which was comparable to the recent literature (11.2%, 161/1433).

CONCLUSIONS

The relatively high number of recurrences in this cohort is explained by the long follow-up and previous (incomplete) surgery in 61.5% of the cases. The inferior outcome of residual IP underscores the importance of having a low threshold for preoperative biopsy in unilateral and atypical sinonasal disease.

Different characteristics of a single sinonasal inverted papilloma from sequential PET-CT: A case report

RATIONALE

Inverted papilloma (IP) is a benign tumor that should be monitored carefully because it frequently recurs and has the potential to become malignant.

PATIENT CONCERNS

We report a case of a 59-year-old woman who presented with a mass which had been found incidentally on positron emission tomography computed tomography (PET CT).

DIAGNOSES

Using endoscopy and CT, the preoperative diagnosis was inverted papilloma. PET CT showed a mass with hot uptake in the left ethmoid and frontal sinus (maximum standardized uptake value (SUVmax) = 7.80).

INTERVENTIONS

We performed endoscopic sinus surgery (ESS) using 4 mm 0° and 70° endoscopes under general anesthesia. After 15 months of follow-up, remnant masses existed in the left frontal and supraorbital ethmoid cells. In the second PET CT taken at this time, a mass with lower SUV compared to the preoperative PET was observed in the lateral side of the left frontal sinus (SUVmax= 1.71). Revision ESS was performed using the "above and below" technique.

OUTCOMES

Two years after initial surgery, follow-up CT showed there was no tumor recurrence in the frontal sinus or supraorbital ethmoid cell. There were no complications such as numbness in the forehead area after the operations.

CONCLUSION

If the tumor is located at a site that is difficult to reach with an endoscope alone, it is faster and less painful to choose a more convenient approach for the patientand it can avoid unnecessary cost burden. It should also be noted that the SUV of PET is not a tool to distinguish IP from other inflammatory polyps or cancer.

Association of Krouse Classification for Sinonasal Inverted Papilloma With Recurrence: A Systematic Review and Meta-analysis

Importance

The risk factors for the recurrence of sinonasal inverted papilloma are still unclear.

Objective

To investigate the potential association between the Krouse classification and the recurrence rates of sinonasal inverted papilloma.

Data Sources

The EMBASE and MEDLINE databases were searched for the period January 1, 1964, through September 30, 2016, using the following search strategy: (paranasal sinuses [Medical Subject Headings (MeSH) terms] OR sinonasal [all fields]) AND (inverted papilloma [MeSH terms] OR (inverted [all fields] AND papilloma [all fields]).

Study Selection

The inclusion criteria were (1) studies including sinonasal inverted papilloma only and no other forms of papillomas, such as oncocytic papilloma; (2) minimum follow-up of 1 year after the surgery; and (3) clear report of cases (recurrence) and controls according to the Krouse classification system or deducible from the full-text article. Literature search was performed by 2 reviewers. Of the 625 articles retrieved in the literature, 97 full-text articles were reviewed. Observational cohort studies or randomized controlled trials were included, and the following variables were extracted from full-text articles: authors of the study, publication year, follow-up data, and number of cases (recurrence) and controls (no recurrence) in each of the 4 stages of the Krouse classification system.

Data Extraction and Synthesis

The Meta-analysis of Observational Studies in Epidemiology (MOOSE) guidelines were followed. Odds ratios (ORs) and 95% CIs were estimated, and data of included studies were pooled using a random-effects model.

Main Outcomes and Measures

The main outcome was recurrence after surgical removal of sinonasal inverted papilloma according to each stage of the Krouse classification system.

Results

Thirteen studies comprising 1787 patients were analyzed. A significant increased risk of recurrence (51%) was highlighted for Krouse stage T3 disease when compared with stage T2 (pooled OR, 1.51; 95% CI, 1.09-2.09). No significant difference in risk of recurrence was found between Krouse stages T1 and T2 disease (pooled OR, 1.14; 95% CI, 0.63-2.04) or between stages T3 and T4 (pooled OR, 1.27; 95% CI, 0.72-2.26).

Conclusions and Relevance

Inverted papillomas classified as stage T3 according to the Krouse classification system presented a 51% higher likelihood of recurrence. Head and neck surgeons must be aware of this higher likelihood of recurrence when planning and performing surgery for sinonasal inverted papilloma.

Evaluation of Patients with Sinonasal and Ventral Skull Base Malignancies

A wide variety of tumors present in the sinonasal and ventral skull base. Patients often have nonspecific symptoms initially and present with advanced tumors, affecting the orbit and other adjacent structures. Evaluation of these malignancies with modern imaging techniques can define tumor invasion, but biopsy is often required to establish a diagnosis because most have a nonspecific appearance. A thorough understanding of the anatomy is the key to treatment planning, and a multidisciplinary approach determines the optimal strategy.

Anterior superior alveolar nerve injury after extended endoscopic medial maxillectomy: a preclinical study to predict neurological morbidity

BACKGROUND

Endoscopic medial maxillectomies (EMMs) are used to optimize exposure of the maxillary sinus and retromaxillary areas. Although in type D EMM (Sturmann-Canfield procedure) the anterior superior alveolar nerve (ASAN) is always at risk of injury, only 29% of patients complained of alveolar process and dental anesthesia. The purpose of this anatomical study is to assess the neural anastomotic network of the ASAN (ASAN-NAN) and describe different extensions of type D EMMs in a preclinical setting.

METHODS

The ASAN and its medial anastomotic branches (MABs) and lateral anastomotic branches (LABs) were evaluated by cone-beam computerized tomography (CBCT). Five different extensions of type D (D1 to D5) EMMs were identified and nerves at risk of injury in each type were assessed by CBCT. Moreover, quantification of surgical corridors was performed on cadaver heads with a neuronavigation system.

RESULTS

Fifty-seven CBCT scans were analyzed. The ASAN would be spared in 16.3% of cases with a type D1 EMM, while it would be injured in the majority of type D2 to D5 resections. At least 1 nerve of the ASAN-NAN was spared in 96.6%, 93%, 74.6%, 0%, and 65.8% of type D1 to D5 EMMs, respectively. Two cadaver heads were dissected and the incremental volume and number of maxillary subsites exposed was assessed in type D1 to D5 EMMs.

CONCLUSION

ASAN function impairment is probably compensated by LABs and MABs. If this hypothesis will be validated in a prospective study on patients, preoperative CBCT evaluation could predict neurological morbidity after type D EMM, and allow tailoring the procedure to minimize impairment of the ASAN-NAN.

Mucocele formation after surgical treatment of inverted papilloma of the frontal sinus drainage pathway

BACKGROUND

Inverted papillomas (IP) inserted in the frontal sinus and/or recess may be treated by using an endoscopic endonasal or an external approach. There are still few data available on this uncommon localization of IPs.

OBJECTIVE

To report our experience in the management of IP of the frontal drainage pathway, to describe a previously unreported specific complication of this surgery, and to discuss the optimal surgical strategy.

METHODS

A retrospective study of the patients at a tertiary care center between 2004 and 2014 who were operated on for an IP with an insertion in the frontal recess and/or the frontal sinus. Clinical charts were reviewed for demographics, clinical presentation, imaging findings, surgical treatment, and outcome.

RESULTS

Twenty-seven patients were included. Patients were operated on by using a purely endoscopic approach (Draf procedure; n = 14 [51.9%]) when the IP was inserted in the frontal recess and/or the frontal sinus infundibulum (with a nasoseptal-septoturbinal flap placed on the exposed bone in four patients), or by using a combined endoscopic and open approach (osteoplastic flap procedure; n = 13 [48.1%]) when the IP invaded the frontal sinus beyond the infundibulum. There were two recurrences (7.4%), with a mean follow-up of 40 months (range, 9-123 months). During follow-up, single or multiple iatrogenic frontal mucoceles were observed in 10 patients (37%), with a mean delay of 60 months (range, 27-89 months). These mucoceles occurred both after using endoscopic (n = 3) or combined (n = 7) approaches, and required a surgical treatment in eight patients. No postoperative mucocele was observed in the four patients who had had a septal flap.

CONCLUSION

In our experience, an approach based on the localization of the IP insertion provided acceptable results in terms of the local control rate (92.6%). However, the significant rate of postoperative mucoceles indicated that specific strategies (such as local flaps) still need to be developed to avoid this iatrogenic complication.

The clinical behavior of sinonasal inverted papilloma with cellular dysplasia: case series and review of the literature

The prognosis and recurrence rate of inverted papilloma (IP) with concomitant cellular dysplasia are not well-delineated. Demographic, clinical and imaging data of all patients who were surgically treated for sinonasal inverted papilloma (SNIP) in our center between 1996 and 2013 were reviewed. Data regarding the coexistence of dysplastic changes or malignancy within the resected tissues were also retrieved. After the exclusion of malignant cases and patients who were lost for follow-up, 92 patients were included in the study. Five patients had coexisting cellular dysplasia (4.7%), four of them had severe dysplasia and one had mild-to-moderate dysplasia. All four cases with severe dysplasia recurred, three were primarily treated endoscopically and one by external approach. Only the case with mild to moderate dysplasia which had been treated by subcranial approach did not recur. Patients with dysplasia had significantly higher recurrence rate than patients without dysplasia (80 vs. 14%, p = 0.019). This significant relation between histology and recurrence remained even after adjustment to tumor extent. The adjusted odd ratio of dysplasia (dysplasia vs. no dysplasia) is 9.7, p = 0.043. SNIP with dysplasia should be treated aggressively and followed closely. The histopathologic investigation of SNIP specimens should always note the presence of dysplasia and its severity. Further investigation on the clinical behavior of SNIP with dysplasia is needed. Multicenter studies are warranted due to the rarity of dysplastic SNIP.

Advances in recurrence and malignant transformation of sinonasal inverted papillomas

Sinonasal inverted papilloma (SIP) is a benign tumor of the nasal cavity and sinus. SIP is characterized by aggressive malignant transformation and a high rate of recurrence. Inadequate removal of the tumor during surgery is one of the most significant contributors to SIP recurrence. A growing body of evidence suggests that molecular alteration in SIP, including human papilloma virus infections, single nucleotide polymorphisms of key genes, deregulation of signaling pathways and immunological changes, may lead to SIP occurrence and malignant transformation. However, the extent to which these molecular mechanisms contribute to SIP pathology and transformation remains unclear due to limited research. Further studies are warranted to elucidate the primary dependent factors that contribute to SIP etiology. The present article reviewed risk factors of progression and recurrence of SIP, including outdoor and industrial occupational exposure, smoking, septal deviation, SIP location, recurrent cases, stage of SIP-associated squamous cell carcinoma and choice of surgical method.

Sinonasal Inverted Papilloma: Risk Factors for Local Recurrence After Surgical Resection

Objectives:

Sinonasal inverted papillomas (SIP) present a potential for recurrence years after the surgery, but most studies report short-term follow-up, and risk factors for recurrence are still debated. Furthermore, several classifications are described, and no consensus exists regarding which one should be used. The aims of this study were to report our long-term results, investigate for potential risk factors for recurrence, and compare the existing 8 staging systems.

Methods:

Over a 28-year period, 110 patients with a diagnosis of SIP were enrolled. The median follow-up time was 55.6 months.

Results:

In multivariate Cox regression modeling, history of previous surgery was the only variable associated with recurrence (hazard ratio = 4.91, 95% CI, 1.80-13.39). Recurrences occurred up to 60 months after the surgery. Among the 8 staging systems, none proved to be associated with recurrence.

Conclusion:

The only factor associated with recurrence of SIP was prior surgery, probably corresponding to an incomplete initial resection. Due to late recurrences, an extended follow-up of at least 5 years is mandatory. In the absence of a classification predicting prognosis, Krouse’s staging system should be used to homogenize studies’ report since it is the most widely used.

Combined endonasal and eyelid approach for management of extensive frontal sinus inverting papilloma

OBJECTIVES

Sinonasal inverting papilloma (IP) is a benign but locally aggressive mucosal neoplasm with a high recurrence rate. Extension into the frontal sinus presents surgical challenges for endonasal resection. This study presents an orbitofrontal approach for managing extensive IP.

STUDY DESIGN

Case series.

METHODS

Four patients seen between 2012 and 2016 with biopsy-proven IP with lateral frontal sinus extension underwent a combined endonasal and transpalpebral approach for tumor resection. Patient demographic data, preoperative characteristics, imaging, and follow-up data were compiled through retrospective chart review. Patients were selected for this approach when the tumor extended to the posterior frontal sinus wall, lateral frontal sinus recess, and orbit. Tumors were first approached endonasally until the frontal recess was reached. A Draf IIB or Draf III procedure was then performed to gain better exposure. Orbitofrontal exposure was achieved through an upper eyelid incision. Miniorbitofrontal craniotomy window was designed based on tumor location. Resection of the frontal and orbital extension was enhanced by endoscopic-assisted dissection through the orbitofrontal window.

RESULTS

The transpalpebral approach provided access to all walls of the ipsilateral frontal sinus, the intersinus septum, and the medial aspect of the contralateral sinus. Complete tumor resection was achieved in all patients. There were no orbital complications, no visible eyelid asymmetry or scarring, and all patients had preserved forehead sensation. There were no recurrences on follow-up.

CONCLUSION

Combining a transpalpebral orbitofrontal craniotomy with the endonasal approach allows complete resection of invasive IP with extension into the frontal sinus. This is achieved with great cosmetic results.

LEVEL OF EVIDENCE

4. Laryngoscope, 128:3-9, 2018.

"TuNa-saving" endoscopic medial maxillectomy: a surgical technique for maxillary inverted papilloma

The maxillary sinus is the most common site of sinonasal inverted papilloma. Endoscopic sinus surgery, in particular endoscopic medial maxillectomy, is currently the gold standard for treatment of maxillary sinus papilloma. Although a common technique, complications such as stenosis of the lacrimal pathway and consequent development of epiphora are still possible. To avoid these problems, we propose a modification of this surgical technique that preserves the head of the inferior turbinate and the nasolacrimal duct. A retrospective analysis was performed on patients treated for maxillary inverted papilloma in three tertiary medical centres between 2006 and 2014. Pedicle-oriented endoscopic surgery principles were applied and, in select cases where the tumour pedicle was located on the anterior wall, a modified endoscopic medial maxillectomy was carried out as described in this paper. From 2006 to 2014 a total of 84 patients were treated. A standard endoscopic medial maxillectomy was performed in 55 patients (65.4%), while the remaining 29 (34.6%) had a modified technique performed. Three recurrences (3/84; 3.6%) were observed after a minimum follow-up of 24 months. A new surgical approach for select cases of maxillary sinus inverted papilloma is proposed in this paper. In this technique, the endoscopic medial maxillectomy was performed while preserving the head of the inferior turbinate and the nasolacrimal duct ("TuNa-saving"). This technique allowed for good visualization of the maxillary sinus, good oncological control and a reduction in the rate of complications.