Lack of consensus among Canadian pediatric surgeons regarding the management of congenital cystic adenomatoid malformation of the lung

Outcome of fetal congenital pulmonary malformations: a systematic review and meta-analysis

OBJECTIVES

To report the outcome of fetuses with a prenatal diagnosis of congenital lung malformation (CLM) diagnosed on ultrasound by performing a comprehensive assessment of these outcomes through a systematic review and meta-analysis.

CONTENT

CLMs are a heterogeneous group of anomalies that involve the lung parenchyma and its bronchovascular structures. Their presentation and evolution are variable, from entirely asymptomatic lesions with sonographic regression in utero to hydropic fetuses requiring fetal therapy, intrauterine death or neonatal morbidity. A systematic review was conducted in Medline, Embase and Cochrane databases including studies on fetuses with CLM diagnosed prenatally in order to report the in-utero natural history of these lesions. Thirty-nine studies (2,638 fetuses) were included in the final review.

SUMMARY

Regression/reduction in size of the lung lesion during pregnancy was reported in 31 % of cases, while its increase in 8.5 % of cases. Intra-uterine death complicated 1.5 % of pregnancies with fetal CLM, while neonatal and perinatal death were 2.2 and 3 %, respectively. Neonatal morbidity occurred in 20.6 % of newborns with CLM; 46 % had surgery, mainly elective. In fetuses with CLM and hydrops, fetal/perinatal loss occurred in 42 %. Assessment of the role of fetal therapy in improving the outcomes of pregnancies complicated by CLM was hampered by the small number of included cases and heterogeneity of type of interventions.

OUTLOOK

Fetuses with CLM prenatally diagnosed have a generally favorable outcome. Conversely, there is a low quality of evidence on the actual role of fetal therapy in improving the outcome of fetuses presenting with these anomalies.

Selection of potential targets for stratifying congenital pulmonary airway malformation patients with molecular imaging: is MUC1 the one?

Currently there is a global lack of consensus about the best treatment for asymptomatic congenital pulmonary airway malformation (CPAM) patients. The somatic KRAS mutations commonly found in adult lung cancer combined with mucinous proliferations are sometimes found in CPAM. For this risk of developing malignancy, 70% of paediatric surgeons perform a resection for asymptomatic CPAM. In order to stratify these patients into high- and low-risk groups for developing malignancy, a minimally invasive diagnostic method is needed, for example targeted molecular imaging. A prerequisite for this technique is a cell membrane bound target. The aim of this study was to review the literature to identify potential targets for molecular imaging in CPAM patients and perform a first step to validate these findings.A systematic search was conducted to identify possible targets in CPAM and adenocarcinoma in situ (AIS) patients. The most interesting targets were evaluated with immunofluorescent staining in adjacent lung tissue, KRAS+ CPAM tissue and KRAS- CPAM tissue.In 185 included studies, 143 possible targets were described, of which 20 targets were upregulated and membrane-bound. Six of them were also upregulated in lung AIS tissue (CEACAM5, E-cadherin, EGFR, ERBB2, ITGA2 and MUC1) and as such of possible interest. Validating studies showed that MUC1 is a potential interesting target.This study provides an extensive overview of all known potential targets in CPAM that might identify those patients at risk for malignancy and conducted the first step towards validation, identifying MUC1 as the most promising target.

Congenital lung abnormalities on magnetic resonance imaging: the CLAM study

OBJECTIVES

Follow-up of congenital lung abnormalities (CLA) is currently done with chest computer tomography (CT). Major disadvantages of CT are exposure to ionizing radiation and need for contrast enhancement to visualise vascularisation. Chest magnetic resonance imaging (MRI) could be a safe alternative to image CLA without using contrast agents. The objective of this cohort study was to develop a non-contrast MRI protocol for the follow-up of paediatric CLA patients, and to compare findings on MRI to postnatal CT in school age CLA patients.

METHODS

Twenty-one CLA patients, 4 after surgical resection and 17 unoperated (mean age 12.8 (range 9.4-15.9) years), underwent spirometry and chest MRI. MRI was compared to postnatal CT on appearance and size of the lesion, and lesion associated abnormalities, such as hyperinflation and atelectasis.

RESULTS

By comparing school-age chest MRI to postnatal CT, radiological appearance and diagnostic interpretation of the type of lesion changed in 7 (41%) of the 17 unoperated patients. In unoperated patients, the relative size of the lesion in relation to the total lung volume remained stable (0.9% (range - 6.2 to + 6.7%), p = 0.3) and the relative size of lesion-associated parenchymal abnormalities decreased (- 2.2% (range - 0.8 to + 2.8%), p = 0.005).

CONCLUSION

Non-contrast-enhanced chest MRI was able to identify all CLA-related lung abnormalities. Changes in radiological appearance between MRI and CT were related to CLA changes, patients' growth, and differences between imaging modalities. Further validation is needed for MRI to be introduced as a safe imaging method for the follow-up of paediatric CLA patients.

KEY POINTS

• Non-contrast-enhanced chest MRI is able to identify anatomical lung changes related to congenital lung abnormalities, including vascularisation. • At long-term follow-up, the average size of congenital lung abnormalities in relation to normal lung volume remains stable. • At long-term follow-up, the average size of congenital lung abnormalities associated parenchymal abnormalities such as atelectasis in relation to normal lung volume decreases.

COllaborative Neonatal Network for the first European CPAM Trial (CONNECT): a study protocol for a randomised controlled trial

INTRODUCTION

Consensus is lacking on the optimal management of asymptomatic congenital pulmonary airway malformation (CPAM). For future studies, the CONNECT consortium (the COllaborative Neonatal Network for the first European CPAM Trial)-an international collaboration of specialised caregivers-has established consensus on a core outcome set of outcome parameters concerning respiratory insufficiency, surgical complications, mass effect and multifocal disease. These outcome parameters have been incorporated in the CONNECT trial, a randomised controlled trial which, in order to develop evidence-based practice, aims to compare conservative and surgical management of patients with an asymptomatic CPAM.

METHODS AND ANALYSIS

Children are eligible for inclusion after the CPAM diagnosis has been confirmed on postnatal chest CT scan and they remain asymptomatic. On inclusion, children are randomised to receive either conservative or surgical management. Subsequently, children in both groups are enrolled into a standardised, 5-year follow-up programme with three visits, including a repeat chest CT scan at 2.5 years and a standardised exercise tolerance test at 5 years.The primary outcome is exercise tolerance at age 5 years, measured according to the Bruce treadmill protocol. Secondary outcome measures are molecular genetic diagnostics, validated questionnaires-on parental anxiety, quality of life and healthcare consumption-, repeated imaging and pulmonary morbidity during follow-up, as well as surgical complications and histopathology. This trial aims to end the continuous debate surrounding the optimal management of asymptomatic CPAM.

ETHICS AND DISSEMINATION

This study is being conducted in accordance with the Declaration of Helsinki. The Medical Ethics Review Board of Erasmus University Medical Centre Rotterdam, The Netherlands, has approved this protocol (MEC-2022-0441). Results will be disseminated through peer-reviewed scientific journals and conference presentations.

TRIAL REGISTRATION NUMBER

NCT05701514.

Does Timing of Resection Influence the Presence of Inflammation within Congenital Lung Malformations?

INTRODUCTION

 Opinion remains divided on whether to resect an asymptomatic congenital lung malformation (CLM) and on optimal timing of resection. This study aimed to determine if age at resection of CLM correlates with the presence of histological inflammation and/or incidence of prior antibiotic administration for lower respiratory tract infection (LRTI).

MATERIALS AND METHODS

 A retrospective review of all CLMs resected between 2009 and 2021 was carried out. Data on antenatal detection, incidence of preoperative antibiotic use for LRTI, operative details, and histological reports were analyzed. Fisher's exact test and logistic regression were used to look for correlation between age at resection and (1) histological inflammation and/or (2) preoperative LRTI.

RESULTS

 A total of 102 patients underwent resection at age 14 months (interquartile range: 6-23). Eighty percent of children were asymptomatic in the neonatal period and 22% of these went on to develop a respiratory symptom. In total, 59% of specimens had histological evidence of inflammation, with a significantly higher rate of inflammation after 10 months of age (71 vs. 35%; p = 0.0012). Logistic regression showed there was a positive correlation between age at resection and treatment for previous LRTI (p = 0.020).

CONCLUSION

 Detection rates of inflammation in specimens resected after 10 months of age are double the rates of those resected prior to 10 months. Delaying resection of CLMs showed a higher frequency of treatment of LRTI. Earlier resection may therefore be advantageous for centers pursuing a resection strategy for asymptomatic lesions.

Long-Term Results of Pediatric Congenital Pulmonary Malformation: A Population-Based Matched Case-Control Study with a Mean 7-Year Follow-Up

Symptomatic congenital pulmonary malformations (CPMs) are a group of anomalies involving the lungs. The long-term outcomes of these patients are not well known. The present research aimed to study the pulmonary function, respiratory morbidity, and health-related quality of life (QoL) of patients treated for CPMs. All children (<16 years of age) treated for CPMs in 2002−2012 (in Oulu University Hospital) were invited to the follow-up visit. Altogether, there were 22 patients, out of which 17 (77%) participated. The mean follow-up time was 6.6 (ranged from 3 to 16) years. Pulmonary function tests, diffusing capacity, respiratory morbidity, and QoL were determined as the primary outcomes. Potential residual malformations and lung anatomy were investigated using computer tomography (CT) imaging. The outcomes were compared to the age- and sex-matched healthy controls. The forced expiratory volume at 1 s (FEV1, Z-score) remained lower in operated patients compared to the healthy controls (−1.57 ± SD 1.35 vs. −0.39 ± SD −0.86, p-value 0.005). There were no differences in respiratory morbidity or QoL between the patients and the controls. The surgical approach (lobectomy vs. partial resection) did not affect lung function. A younger age (<1 year of age) at the time of the surgery seemed to result in a higher lung capacity, but the finding was not statistically significant. Patients with CPMs treated with surgery were satisfied with their wellbeing in the long-term. A lower lung function did not have an impact on their wellbeing. However, there was a slight decrease in lung function compared to the healthy controls, and a clinical follow-up of the patients was recommended.

Quantitative CT imaging analysis to predict pathology features in patients with a congenital pulmonary airway malformation

BACKGROUND

Risk for infection and potential malignant degeneration are the most common arguments for resecting asymptomatic Congenital Pulmonary Airway Malformations (CPAM). We aimed to investigate if CT- imaging characteristics can be used to predict histopathological features, by using an objective quantitative CT scoring method.

METHODS

Archival CPAM tissue samples were histologically re-assessed and patients who had a pre-operative volumetric CT-scan were included. Lung disease was quantified using the newly-developed congenital lung abnormality quantification(CLAQ) scoring method and obtained percentages were used to predict histopathological signs of inflammation and presence of mucinous proliferation (MP). Because MP is presumed a precursor for mucinous adenocarcinoma in situ (AIS) this method was also used to compare CT-scans of patients with AIS to those with only CPAM.

RESULTS

Thirty-three CPAM patients were included of which 13(39%) had histological signs of inflammation and 8(24%) had a MP. Patients with inflammation had a significantly smaller lesion (14% vs 38%) while those with MP had more extensive disease (54%vs17%). Patients with AIS had a significantly smaller lesion compared to CPAM patients (5%vs29%). Significant predictors for inflammation were smaller lesion size and percentage hypodensity within lesions while a larger lesion size and percentage parenchymal hyperdensity (solid lung tissue components) were predictors for MP as well as AIS.

CONCLUSIONS

Smaller CPAM lesions may be more susceptible to inflammation while larger lesions may be associated with the presence of MP. Parenchymal hyperdensity is found as a predictor for MP as well as AIS and should therefore elicit more extensive gross sampling.

LEVEL OF EVIDENCE

Level III.

Whole-Genome Methylation Study of Congenital Lung Malformations in Children

Background and Objectives

The treatment of asymptomatic patients with congenital pulmonary malformations (CPMs) remains controversial, partially because the relationship between congenital lung malformations and malignancy is still undefined. Change in methylation pattern is a crucial event in human cancer, including lung cancer. We therefore studied all differentially methylated regions (DMRs) in a series of CPMs in an attempt to find methylation anomalies in genes already described in association with malignancy.

Methods

The DNA extracted from resected congenital lung malformations and control lung tissue was screened using Illumina MethylationEPIC arrays. Comparisons between the group of malformed samples or the malformed samples of same histology or each malformed sample and the controls and between a pleuropulmonary blastoma (PPB) and controls were performed. Moreover, each malformed sample was pairwise compared with its respective control. All differentially methylated regions (DMRs) with an adjusted p-value <0,05 were studied.

Results

Every comparison highlighted a number of DMRs closed to genes involved either in cell proliferation or in embryonic development or included in the Cancer Gene Census. Their abnormal methylation had been already described in lung tumors.

Conclusions

Methylation anomalies already described in lung tumors and also shared by the PPB were found in congenital lung malformations, regardless the histology. The presence of methylation abnormalities is suggestive of a correlation between congenital lung malformations and some step of malignant transformation.

In vitro models of fetal lung development to enhance research into congenital lung diseases

PURPOSE

This paper aims to build upon previous work to definitively establish in vitro models of murine pseudoglandular stage lung development. These can be easily translated to human fetal lung samples to allow the investigation of lung development in physiologic and pathologic conditions.

METHODS

Lungs were harvested from mouse embryos at E12.5 and cultured in three different settings, i.e., whole lung culture, mesenchyme-free epithelium culture, and organoid culture. For the whole lung culture, extracted lungs were embedded in Matrigel and incubated on permeable filters. Separately, distal epithelial tips were isolated by firstly removing mesothelial and mesenchymal cells, and then severing the tips from the airway tubes. These were then cultured either in branch-promoting or self-renewing conditions.

RESULTS

Cultured whole lungs underwent branching morphogenesis similarly to native lungs. Real-time qPCR analysis demonstrated expression of key genes essential for lung bud formation. The culture condition for epithelial tips was optimized by testing different concentrations of FGF10 and CHIR99021 and evaluating branching formation. The epithelial rudiments in self-renewing conditions formed spherical 3D structures with homogeneous Sox9 expression.

CONCLUSION

We report efficient protocols for ex vivo culture systems of pseudoglandular stage mouse embryonic lungs. These models can be applied to human samples and could be useful to paediatric surgeons to investigate normal lung development, understand the pathogenesis of congenital lung diseases, and explore novel therapeutic strategies.

Narrative review of congenital lung lesions

This article reviews the contemporary diagnosis and management of antenatally diagnosed congenital lung lesions. These anomalies, which include congenital pulmonary airway malformation (CPAM) (formerly congenital cystic adenomatoid malformation), bronchopulmonary sequestration (BPS), bronchogenic cyst, and congenital lobar emphysema (CLE), are relatively rare but are increasingly encountered by clinicians because of the improved resolution and enhanced sensitivity of fetal ultrasound. Serial assessment of these lesions throughout pregnancy remains the norm rather than the exception. Perinatal management strategies may differ based on initial size and growth patterns of these masses until delivery. Fetal magnetic resonance imaging and other diagnostic testing can sometimes be helpful in providing additional prognostic information. Over the last decade, maternal steroids have become standard of care in the management of larger lesions at risk for nonimmune hydrops. As a result, fetal surgical procedures, including open resection, thoracoamniotic shunting, and ex utero intrapartum treatment (EXIT), are less uncommonly performed. Decisions regarding whether delivery of these fetuses should occur in a tertiary care center with pediatric surgery coverage versus delivery at a local community hospital are now highly relevant in most prenatal counseling discussions with families. Large lung malformations may require urgent surgical removal in the early postnatal period because of respiratory distress. Other complications, such as recurrent pneumonia, pneumothorax, and cancer, are indications for postnatal lung resection on an elective basis. Many children are good candidates for minimally invasive (thoracoscopic) surgical approaches as an alternative to resection by thoracotomy. In the vast majority of cases, the overall prognosis remains excellent.

Development of a core outcome set for congenital pulmonary airway malformations: study protocol of an international Delphi survey

INTRODUCTION

A worldwide lack of consensus exists on the optimal management of asymptomatic congenital pulmonary airway malformation (CPAM) even though the incidence is increasing. Either a surgical resection is performed or a wait-and-see policy is employed, depending on the treating physician. Management is largely based on expert opinion and scientific evidence is scarce. Wide variations in outcome measures are seen between studies making comparison difficult thus highlighting the lack of universal consensus in outcome measures as well. We aim to define a core outcome set which will include the most important core outcome parameters for paediatric patients with an asymptomatic CPAM.

METHODS AND ANALYSIS

This study will include a critical appraisal of the current literature followed by a three-stage Delphi process with two stakeholder groups. One surgical group including paediatric as well as thoracic surgeons, and a non-surgeon group including paediatric pulmonologists, intensive care and neonatal specialists. All participants will score outcome parameters according to their level of importance and the most important parameters will be determined by consensus.

ETHICS AND DISSEMINATION

Electronic informed consent will be obtained from all participants. Ethical approval is not required. After the core outcome set has been defined, we intend to design an international randomised controlled trial: the COllaborative Neonatal NEtwork for the first CPAM Trial, which will be aimed at determining the optimal management of patients with asymptomatic CPAM.

Congenital lung abnormality quantification by computed tomography: The CLAQ method

INTRODUCTION

To date, no consensus has been reached on the optimal management of congenital lung abnormalities, and factors predicting postnatal outcome have not been identified. We developed an objective quantitative computed tomography (CT) scoring method, and assessed its value for clinical decision-making.

METHODS

Volumetric CT-scans of all patients born with a congenital lung abnormality between January 1999 and 2018 were assessed. Lung disease was quantified using the newly-developed congenital lung abnormality quantification (CLAQ) scoring method. In 20 equidistant axial slices, cells of a square grid were scored according to the abnormality within. The scored CT parameters were used to predict development of symptoms, and SD scores for spirometry and exercise tolerance (Bruce treadmill test) at 8 years of age.

RESULTS

CT-scans of 124 patients with a median age of 5 months were scored. Clinical diagnoses included congenital pulmonary airway malformation (49%), bronchopulmonary sequestration (27%), congenital lobar overinflation (22%), and bronchogenic cyst (1%). Forty-four patients (35%) developed symptoms requiring surgery of whom 28 (22%) patients became symptomatic before a CT-scan was scheduled. Lesional hyperdensity was found as an important predictor of symptom development and decreased exercise tolerance. Using receiver operating characteristic analysis, an optimal cut-off value for developing symptoms was found at 18% total disease.

CONCLUSION

CT-quantification of congenital lung abnormalities using the CLAQ method is an objective and reproducible system to describe congenital lung abnormalities on chest CT. The risk for developing symptoms may increase when more than a single lung lobe is affected.

Asymptomatic congenital lung malformations: Is nonoperative management a viable alternative?

INTRODUCTION

The purpose of this study was to evaluate clinical outcomes in children with asymptomatic congenital lung malformations (CLM) who were initially managed nonoperatively.

METHODS

An IRB-approved retrospective review was performed on all CLMs at a single tertiary care referral center (Jan 2006-Dec 2016, n=140). Asymptomatic cases that did not undergo elective resection were evaluated for subsequent CLM-related complications based on clinical records and a telephone quality of life survey.

RESULTS

Out of 39 (27.9%) who were initially managed nonoperatively, 13 (33%) developed CLM-related symptoms and underwent surgical intervention at a median age of 6.8years (range, 0.7-19.8years). The most common indication for conversion to operative management was pneumonia (78%). Larger lesions, as measured by CT scan, were significantly associated with the need for subsequent surgical intervention (mean maximal diameter, 5.7 vs. 2.9cm; p=0.005). Based on survey data with a median follow up of 3.9years (range, 0.2-13.2years), 17% developed chronic pulmonary symptoms, including cough (11%) and asthma requiring bronchodilators (12%).

CONCLUSION

Although these data support nonoperative management as a viable alternative to surgical resection, at least one-third of CLM children eventually develop pneumonia or other pulmonary symptoms. Larger lesions are correlated with an increased risk for eventual surgical resection.

LEVEL OF EVIDENCE

Level IV.

Optimal timing for elective resection of asymptomatic congenital pulmonary airway malformations

PURPOSE

We sought to determine optimal timing for CPAM resection within the first year of life.

METHODS

We queried the National Surgical Quality Improvement Program pediatric database from 2012 to 2015 for elective CPAM resections on patients less than 1year of age. Patients were divided by age in months: 1-3 (n=57), 4-6 (n=135), and 6-12 (n=214). Patient operative variables and 30-day postoperative outcomes were compared.

RESULTS

A total of 406 patients were included with no differences in demographics or comorbidities. Median operative time increased with each older age category (115min, 152min, 163min, respectively; p<0.01). Thoracoscopic approach was less utilized in 1-3months (40.4%) compared to the older two age categories (65.9% and 69.6%, respectively; p<0.01). There were no differences by age in major complications, conversion to open, or readmissions. On multivariate analysis, ASA class≥3 (p<0.01) and prolonged operative time (p<0.01) were associated with a major complication. Furthermore, operations on patients aged 6-12months were associated with increased operative time (p<0.01) regardless of operative approach.

CONCLUSION

Elective CPAM resections are equally safe in patients 1-12months of age. Earlier resection including both open and thoracoscopic resection is associated with decreased operative time.

LEVEL OF EVIDENCE

IIc, Outcomes Research.

Decision-Making Criteria for Observational Management of Congenital Pulmonary Airway Malformations (CPAMs)

PURPOSE

The purpose of this study was to determine practice patterns of Canadian surgeons managing congenital pulmonary airway malformations (CPAMs) and factors influencing practice.

METHODS

Pediatric surgeons in Canada were surveyed regarding their experience, evaluation, and management CPAMs, and what factors they feel qualify patients for observation vs resection. Data were summarized, and Fisher's-Exact and Kruskal-Wallis Tests applied where appropriate.

RESULTS

Sixty eight percent (n=46) of surgeons responded. However, three surveys were incomplete and excluded. The median age of initial assessment by a pediatric surgeon was one month. 98% (42/43) use CXR for initial imaging, and 83% (36/43) recommend CT scan for further evaluation. Observation is offered always, almost always, or sometimes by 2%, 35% and 37%, respectively. Only 16% almost never, and 9% never offer it. Years in practice was not associated with this decision (p=0.41). Of surgeons who offer observation, 78% (28/37) use morphology to guide their decision, and 63% (21/37) use lesion size (<1cm to <5cms). 68%(23/37) consider the number of lesions, and 61%(14/23) of those only offer observation to solitary lesions.

CONCLUSION

Most pediatric surgeons in Canada offer observational management to patients with asymptomatic CPAMs. While practice variations exist, detailed imaging with a CT scan early in life to determine the morphology, size, and number of lesions guides practice.

LEVEL OF EVIDENCE

V.

Treatment of congenital pulmonary airway malformations: a systematic review from the APSA outcomes and evidence based practice committee

PURPOSE

Variation in management characterizes treatment of infants with a congenital pulmonary airway malformation (CPAM). This review addresses six clinically applicable questions using available evidence to provide recommendations for the treatment of these patients.

METHODS

Questions regarding the management of a pediatric patient with a CPAM were generated. English language articles published between 1960 and 2014 were compiled after searching Medline and OvidSP. The articles were divided by subject area and by the question asked, then reviewed and included if they specifically addressed the proposed question.

RESULTS

1040 articles were identified on initial search. After screening abstracts per eligibility criteria, 130 articles were used to answer the proposed questions. Based on the available literature, resection of an asymptomatic CPAM is controversial, and when performed is usually completed within the first six months of life. Lobectomy remains the standard resection method for CPAM, and can be performed thoracoscopically or via thoracotomy. There is no consensus regarding a monitoring protocol for observing asymptomatic lesions, although at least one chest computerized tomogram (CT) should be performed postnatally for lesion characterization. An antenatally identified CPAM can be evaluated with MRI if fetal intervention is being considered, but is not required for the fetus with a lesion not at risk for hydrops. Prenatal consultation should be offered for infants with CPAM and encouraged for those infants in whom characteristics indicate risk of hydrops.

CONCLUSIONS

Very few articles provided definitive recommendations for care of the patient with a CPAM and none reported Level I or II evidence. Based on available information, CPAMs are usually resected early in life if at all. A prenatally diagnosed congenital lung lesion should be evaluated postnatally with CT, and prenatal counseling should be undertaken in patients at risk for hydrops.

Resection of pediatric lung malformations: National trends in resource utilization & outcomes

PURPOSE

We sought to determine factors influencing survival and resource utilization in patients undergoing surgical resection of congenital lung malformations (CLM). Additionally, we used propensity score-matched analysis (PSMA) to compare these outcomes for thoracoscopic versus open surgical approaches.

METHODS

Kids' Inpatient Database (1997-2009) was used to identify congenital pulmonary airway malformation (CPAM) and pulmonary sequestration (PS) patients undergoing resection. Open and thoracoscopic CPAM resections were compared using PSMA.

RESULTS

1547 cases comprised the cohort. In-hospital survival was 97%. Mortality was higher in small vs. large hospitals, p<0.005. Survival, pneumothorax (PTX), and thoracoscopic procedure rates were higher, while transfusion rates and length of stay (LOS) were lower, in children ≥3 vs. <3months (p<0.001). Multivariate analysis demonstrated longer LOS for older patients and Medicaid patients (all p<0.005). Total charges (TC) were higher for Western U.S., older children, and Medicaid patients (p<0.02). PSMA for thoracoscopy vs. thoracotomy in CPAM patients showed no difference in outcomes.

CONCLUSION

CLM resections have high associated survival. Children <3months of age had higher rates of thoracotomy, transfusion, and mortality. Socioeconomic status, age, and region were independent indicators for resource utilization. Extent of resection was an independent prognostic indicator for in-hospital survival. On PSMA, thoracoscopic resection does not affect outcomes.

Association between Congenital Lung Malformations and Lung Tumors in Children and Adults: A Systematic Review

INTRODUCTION

The appropriate management of asymptomatic congenital pulmonary malformations (CPMs) remains controversial. Prophylactic surgery is recommended to avoid the risk for development of pulmonary infections and to prevent the highly debated development of malignancy. However, the true risk for development of malignancy remains unknown. A systematic review analyzed all cases in which lung tumors associated with CPMs in both the pediatric and adult populations were described.

METHODS

A comprehensive literature search was carried out; it included all the cases in which an association between CPMs and malignant pulmonary lesions was reported.

RESULTS

In all, 134 publications were eligible for inclusion. In 168 patients CPM was found associated with lung tumor. The diagnosis was made in 76 children at a mean age of 3.68 ± 3.4, whereas in the adult population (n = 92) it was made at a mean age of 44.62 ± 16.09. Cough was the most frequent presenting symptom both in children and in adults. Most of the patients underwent lobectomy. The tumor most often associated with CPM was pleuropulmonary bastoma in children (n = 31) and adenocarcinoma (n = 20) or bronchioloalveolar carcinoma (n = 20) in adults. The CPM most frequenty associated with tumors in children was congenital cystic adenomatoid malformation (n = 37), especially type 1 (n = 21), whereas in adults it was bronchogenic cyst (n = 25), followed by congenital cystic adenomatoid malformation (n = 21).

CONCLUSIONS

CPMs should be followed up and never underestimated because they may conceal a tumor. Apparently, there is no age limit for malignant progression of CPMs and no limit of the interval between first detection of the CPM and appearance of the associated tumor.

Morbidity after elective resection of prenatally diagnosed asymptomatic congenital pulmonary airway malformations

BACKGROUND/AIM

The optimal management of prenatally diagnosed asymptomatic congenital pulmonary airway malformations (CPAM) is controversial. Since there is a paucity of data relating to surgical risks in this specific population, we reviewed our experience to further inform this controversy.

METHODS

Ethically approved 10 year (2004-2013) retrospective review. Patients were included only if the CPAM was diagnosed prenatally and remained asymptomatic. Indication for surgery was physician recommendation and/or parental choice.

MAIN RESULTS

Sixty patients were identified. Median age at surgery was 6.5 months (range 65 days to 9.6 years). Resections were performed thoracoscopically (n = 51, one conversion) or by thoracotomy (n = 9). Surgical time was 2.5 hr (43 min to 4.75 hr). A chest drain was used in 58/60 and remained in situ 53 hr (23-108). There were no intra-operative complications or blood transfusions. All patients were extubated at the end of the procedure with no re-intubations. Post-operative hospitalization was 73.4 hr (23.8 hr to 4.2 days). Overall, complications occurred in 14/60 (23%). Eleven were minor but three were major: tension pneumothorax associated with new presentation of a small previously undiagnosed diaphragmatic hernia 5 days following resection; aggressive fibromatosis of the chest wall in the region close to resection 2 years later; and near-fatal hypovolemic cardiac arrest due to massive haemorrhage from a feeding vessel on postoperative day 7. There were no deaths and no cases of pleuropulmonary blastoma.

CONCLUSION

Resection of prenatally diagnosed asymptomatic CPAM is associated with a significant risk of complications, which may be life threatening. These data contribute to a balanced discussion of risks and benefits for these children.

Risk-reduction surgery in pediatric surgical oncology: A perspective

OBJECTIVE

A small percentage of pediatric solid cancers arise as a result of clearly identified inherited predisposition syndromes and nongenetic lesions. Evidence supports preemptive surgery for children with genetic [multiple endocrine neoplasia type 2 (MEN2), familial adenomatous polyposis syndrome (FAP), hereditary nonpolyposis colorectal cancer (HNPCC), and hereditary diffuse gastric cancer (HDGC) and nongenetic [thyroglossal duct cysts (TGDC), congenital pulmonary airway malformations (CPAM), alimentary tract duplication cysts (ATDC), and congenital choledochal cysts (CCC)] developmental anomalies. Our aim was to explore the utility of risk reduction surgery to treat and prevent cancer in children.

METHODS

A systematic review of the available peer-reviewed literature on PubMed was performed using a PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) search strategy, where possible. Search items included "risk reduction surgery", "hereditary cancer predisposition syndrome", "multiple endocrine neoplasia type 2", "familial adenomatous polyposis", "hereditary nonpolyposis colorectal cancer", "hereditary diffuse gastric cancer", "thyroglossal duct cysts", congenital pulmonary airway malformations", "alimentary tract duplication cysts", "malignant transformation", and "guidelines".

RESULTS

We identified 67 articles that met the inclusion criteria describing the indications for prophylactic surgery in surgical oncology. For the genetic predisposition syndromes, 7 studies were related to professional endorsed guidelines, 7 were related to surgery for MEN2, 11 were related to colectomy for FAP, 6 were related to colectomy for HNPCC, and 12 related to gastrectomy for HDGC. Articles for the nongenetic lesions included 5 for techniques related to TGDC resection, 9 for surgery for CPAMs, and 10 for resection of ATDCs. Guidelines and strategies varied significantly especially related to the extent and timing of surgical intervention; the exception was for the timing of thyroidectomy in children with MEN2.

CONCLUSION

Current evidence supporting prophylactic surgery in the management of pediatric cancer predisposition syndromes and nongenetic lesions is best delineated for thyroidectomy to prevent medullary thyroid cancer in children with MEN2 (Strength of Recommendation Grade B/C). Despite the lack of pediatric specific evidence-based recommendations regarding the appropriate extent and timing for risk-reduction surgery for FAP, HNPCC, HDGC and nongenetic anomalies, our review represents an opportunity towards understanding the postgenomic development of these lesions and provides current indications and techniques for preemptive cancer prevention surgery in children.

Surgical versus conservative management of congenital pulmonary airway malformation in children: A systematic review and meta-analysis

BACKGROUND

The ideal management of infants born with asymptomatic congenital pulmonary airway malformation (CPAM) is controversial. We performed a systematic review and meta-analysis comparing elective resection versus expectant management.

METHODS

We searched CENTRAL, MEDLINE, EMBASE, CINAHL, and PubMed for studies describing the management of asymptomatic CPAM and reporting on postoperative morbidity, mortality, and length of hospital stay (LOS). We performed meta-analyses when possible and provide a narrative summary of results.

RESULTS

One nonrandomized prospective and eight retrospective studies met our inclusion criteria. Out of 168 patients, 70 underwent surgery before symptoms developed with seven experiencing postoperative complications (10.0%); 63 developed symptoms while being managed expectantly and subsequently underwent surgery with 20 complications (31.8%). Thirty-five patients continued to be followed nonsurgically (three months to nine years of follow-up). Morbidity was higher with surgery after symptom development (6 studies; odds ratio 4.59, 95% confidence interval (CI) 1.40 to 15.11, P<0.01); there was no difference in LOS (3 studies; mean difference 4.96, 95% CI -1.75 to 11.67, P=0.15). There were no related deaths.

CONCLUSIONS

Elective resection of asymptomatic CPAM lesions is safe and prevents the risk of symptom development, which may result in a more complicated surgery and recovery.

Minimally invasive surgery for congenital cystic adenomatoid malformations - early experience

Purpose

The aim of this study is to present our experience with minimally invasive surgery (MIS) for congenital cystic adenomatoid malformations (CCAMs).

Methods

The medical records of infants under 2 years of age who underwent operation for a CCAM from 2009 to 2014 were retrospectively reviewed.

Results

MIS (9 of thoracoscopy and 1 of laparoscopy) was performed for 10 infants (male:female = 7:3) with CCAM. CCAM were discovered prenatally around gestational age of 24.7 weeks. The median gestational age was 38.6 weeks, and the median body weight was 2,817.5 g. None had respiratory distress after birth. The median age at the time of operation was 0.94 years (range: 8 days–1.66 years). Two underwent the operation during the neonatal period; one because of a coexisting large esophageal duplication cyst and the other due to diagnostic uncertainty. While awaiting operation, 5 of CCAM had grown without respiratory symptoms, and 2 infants had experienced pneumonia. The mean operative time was 98 minutes (range: 70–227 minutes), and there were no conversions or perioperative complications. The infants resumed enteral feeding within 2 days and were discharged within 7 days, except for 1 infant who underwent esophageal duplication cyst excision. During the follow-up period, there were no cases of either remnant lesions or respiratory symptoms.

Conclusion

MIS for CCAMs is safe and feasible, with excellent cosmesis and short hospital stays. Increasing experience with various MIS procedures will widen the indications for MIS in lung pathology.

Prenatal and Postnatal Management of Congenital Pulmonary Airway Malformation

Congenital pulmonary airway malformation (CPAM) is one of the most common lung lesions detected prenatally. Despite the research efforts made in the past few years, controversy and lack of clarity in the literature still exist regarding nomenclature, classification, pathogenesis and the management of CPAM. Therefore, it is of greatest importance to delineate the natural history of CPAMs and to create a consensus to guide the management and follow-up of these lesions. This review will focus on classification systems, highlighting the most recent advancements in pathogenesis, and current practice in the prenatal diagnosis of CPAM. Strategies of prenatal management and postnatal management will be reviewed. Long-term follow-up, including lung cancer risk, is discussed and an outcome perspective is presented.

Comparing 30-day outcomes between thoracoscopic and open approaches for resection of pediatric congenital lung malformations: Evidence from NSQIP

BACKGROUND/PURPOSE

Thoracoscopic surgery has been increasingly utilized in treating pediatric congenital lung malformations (CLM). Comparative studies evaluating 30-day outcomes between thoracoscopic and open resection of CLM are lacking.

METHODS

There were 258 patients identified in pediatric NSQIP with a CLM and pulmonary resection in 2012-2013. Comparisons of patient characteristics and outcomes between surgical approaches were made using standard univariate statistics. In addition, a propensity score match was performed to evaluate outcomes in similar patient cohorts.

RESULTS

One-hundred twelve patients (43.4%) received thoracoscopic resections and 146 patients (56.6%) received open resections. Patients undergoing open resections were more likely to be less than 5 months of age and have a comorbidity/preoperative condition (47.3% vs. 25.0%, p<0.001). The extent of resection was a lobectomy in 84.8% of thoracoscopic and 92.5% of open resection patients. Median operative time was similar between both groups (thoracoscopic 172 vs. open 153.5 minutes). On univariate analysis, thoracoscopic resection was associated with decreased postoperative complications (9.8% vs. 25.3%, p=0.001) and LOS (3 vs. 4 days, p<0.001). However, after adjusting for similar patient and operative characteristics, no significant differences were encountered between techniques.

CONCLUSIONS

Thoracoscopic and open resection provide comparable 30-day outcomes and safety in the management of congenital lung malformations.

Rare Lung Diseases: Congenital Malformations

Increasingly, congenital thoracic malformations (CTMs) are diagnosed on antenatal ultrasound, but we lack the evidence to suggest rational management, not least because descriptive terms are used inconsistently. This review describes a simplified clinical classification of CTMs, and contrasts it with pathological descriptions. The age related presentations of CTM are described, together with the differential diagnoses of cystic masses presenting both antenatally and postnatally. Antenatally diagnosed CTMs rarely require intervention before birth; and urgent treatment is only required postnatally if the baby is symptomatic and does not respond to medical management. The asymptomatic baby with an antenatal diagnosis of a CTM presents a management conundrum. Definitive imaging is with high-resolution computed tomography (HRCT), but the optimal timing of imaging is unclear. Whether surgery should be offered to asymptomatic infants is also unclear; in the medium term, 5 % of asymptomatic babies will require surgery for complications of the disease. The most vexed question is malignant change; the risk in the medium term is probably less than 5 %, but we have no way of delineating a high-risk group. Indeed, malignancy has been described even after complete resection of a CTM. The author's personal management is to advocate surgery in the second year of life for all except for the most trivial CTMs, but many would differ and advocate conservative management. More data are needed if we are to rationalise our approach to these infants.

The argument for a non-operative approach to asymptomatic lung lesions

The controversy surrounding the management of congenital lung malformations (CLMs) centre on how best to manage the increasing population of asymptomatic antenatally detected infants. Should elective surgery be offered? Or is a "watch-and-wait" policy safe? This will be addressed in this review by examining the reported complications of surgery, the risk of symptom development if lesions are left in situ and whether this may alter surgical outcomes, and importantly whether there is any long-term risk of malignancy that can be negated by surgical resection in infancy.

Vanishing fetal lung malformations: Prenatal sonographic characteristics and postnatal outcomes

BACKGROUND/PURPOSE

The purpose of this study was to examine the natural history and outcomes of prenatally diagnosed lung masses that appear to undergo complete regression before birth.

METHODS

An IRB-approved retrospective review was performed on 100 consecutive fetuses with a congenital lung malformation at a single fetal center. Prenatal and postnatal imaging as well as outcomes of vanishing fetal masses was analyzed and compared to those with persistent fetal masses.

RESULTS

Seventeen lesions (17%) became sonographically undetectable at 35.3 ± 2.3 weeks gestation. Vanishing fetal masses were associated with microcystic disease (100% vs. 69%, p=0.005) and a low initial congenital pulmonary airway malformation volume ratio (CVR; 0.31 ± 0.35 vs. 0.70 ± 0.66, p=0.002) when compared to those with persistent fetal lesions. Based on postnatal CT imaging and pathology data, 10.3% of all fetal masses completely regressed. The positive predictive value and negative predictive value of prenatal ultrasound for detecting lung malformations in late gestation were 96% and 43%, respectively. All infants with vanishing fetal lesions were asymptomatic at birth and were more likely to be managed nonoperatively (75% vs. 22%, p<0.0001) when compared to infants with persistent fetal masses.

CONCLUSIONS

Vanishing lung lesions late in gestation are relatively common and are associated with a low CVR and microcystic disease.

Antenatally diagnosed lung malformations: a plea for long-term outcome studies

There is a wide variation in the management of infants with antenatally diagnosed lung malformations, with many paediatric surgeons and respiratory paediatricians recommending early investigations for all infants and a surgical excision for the majority of lesions, while others favour a conservative management for all asymptomatic infants. The benefits and risks of a surgical intervention have to be compared with the natural history of the untreated malformation and cohort studies from foetal diagnosis to adult life are required to provide the relevant evidence. Careful and repeated surveillance of identified foetuses is essential as recent advances in foetal medicine and surgery have improved the outcomes for the small minority, who are at risk of developing hydrops.

Congenital pulmonary airway malformation and sequestration: Two standpoints for a single condition

In adults, congenital pulmonary malformations are candidates for surgery due to symptoms. A pre-natal diagnosis is simple and effective, and allows an early thoracoscopic surgical treatment. A retrospective study was performed to assess management in two different populations of adults and children to define the best strategy.

Conservative management of antenatally diagnosed cystic lung malformations

AIM

To review the outcome of all antenatally diagnosed conservatively managed congenital lung malformations (CLMs) managed at our centre.

METHODS

All patients diagnosed antenatally with cystic lung malformations from 2001 to 2011, at a tertiary referral paediatric surgical centre practising a policy of conservative management of asymptomatic cases, were retrospectively reviewed. Data were collected from medical case notes and radiology reports. Ethical approval was obtained from our institutional research and development department.

RESULTS

The complete records of 74 fetuses antenatally diagnosed with CLM were reviewed. There were 72 live births, at a median gestation of 39.6 weeks. Emergency lobectomy was performed in one symptomatic neonate. Elective lobectomies were performed at parental request in three asymptomatic infants, one of whom had a family history of synovial sarcoma. Two patients developed pneumonia in the affected lobe during early childhood and proceeded to lobectomy at the age of 3 years. One patient with a bronchopulmonary sequestration required embolisation for cyanotic episodes. The remaining 65 patients have been conservatively managed to date, and none have required hospital admission. Less than a quarter report mild respiratory symptoms such as cough or wheeze. Median follow-up is 5 years.

CONCLUSIONS

This retrospective cohort study of 74 consecutive CLMs diagnosed antenatally over a 10-year period demonstrates that most of these lesions will remain asymptomatic throughout childhood. Although the natural history of CLMs in later years remains to be elucidated, we hope that this report on medium-term outcomes will be useful to clinicians who undertake antenatal counselling and may inform the discussion on how best to manage these children.

Thoracoscopic vs open lobectomy in infants and young children with congenital lung malformations

BACKGROUND

Although thoracoscopic lobectomy is a widely accepted surgical procedure in adult thoracic surgery, its role in small children remains controversial. The purpose of this study was to evaluate perioperative outcomes after thoracoscopic and open lobectomy in infants and young children with congenital lung malformations at a single academic referral center.

STUDY DESIGN

A cohort study of 62 consecutive children who underwent elective pulmonary lobectomy for a congenital lung lesion between 2001 and 2013 was performed. Patient demographics and perioperative outcomes were evaluated in univariate and logistic regression analyses.

RESULTS

Forty-nine patients underwent thoracoscopy and 13 had a thoracotomy. Six children undergoing thoracoscopy required conversion to thoracotomy (conversion 12.2%). Perioperative outcomes, including median blood loss (2.0 vs 1.1 mL/kg; p = 0.34), chest tube duration (3 vs 3 days; p = 0.33), hospital length of stay (3 vs 3 days; p = 0.42), and morbidity as defined by the Accordion Grading Scale (30.6% vs 30.8%; p = 0.73), were similar between thoracoscopy and thoracotomy, respectively. Although thoracoscopy was associated with increased operative duration compared with thoracotomy (239.9 vs 181.2 minutes, respectively; p = 0.03), thoracoscopy operative times decreased with increasing institutional experience (p = 0.048). Thoracoscopic lobectomy infants younger than 5 months of age had a 2.5-fold higher rate of perioperative adverse outcomes compared with older children (p = 0.048).

CONCLUSIONS

In small children undergoing pulmonary lobectomy, both thoracoscopy and thoracotomy are associated with similar perioperative outcomes. The cosmetic and musculoskeletal benefits of the thoracoscopic approach must be balanced against institutional expertise and a potentially higher risk for complications in younger patients.

Congenital lung malformations: an ongoing controversy

INTRODUCTION

Congenital lung malformations are rare lesions that are most commonly diagnosed antenatally. Management of such lesions, particularly those that are asymptomatic, remains controversial. We undertook a survey to ascertain current practice of surgeons in the UK and Ireland.

METHODS

All consultant members of the British Association of Paediatric Surgeons were asked to complete a survey on congenital lung malformations with respect to antenatal management, symptomatic and asymptomatic lesions, and operative techniques.

RESULTS

Responses were received from 20 paediatric surgical centres and highlighted the ongoing variability in management of such lesions, particularly those that are asymptomatic. Twenty per cent of surgeons never resect an asymptomatic lesion and twenty-four per cent always do. The remainder intervene selectively, with size being the most commonly stated indication. Most resections are undertaken via thoracotomy although 35% of surgeons use thoracoscopy for some procedures.

CONCLUSIONS

National data based on congenital anomaly registers are needed to determine the natural history of these malformations and to guide future management.

Does earlier lobectomy result in better long-term pulmonary function in children with congenital lung anomalies? A prospective study

BACKGROUND

Management of asymptomatic congenital pulmonary airway malformations remains controversial when addressing the optimal timing of surgical resection. Neonatal resection is advocated by some based on the theory that earlier lobectomy results in greater compensatory lung growth. We examined whether age at lobectomy is correlated with better pulmonary outcomes as reflected by pulmonary function and exercise testing.

METHODS

Patients who had lobectomy for congenital pulmonary airway malformation between 1985 and 2002 were identified and underwent detailed clinical history, physical examination, pulmonary function testing (total lung capacity, forced vital capacity, forced expiratory volume in 1 second), and exercise testing (power, maximal oxygen uptake [Vo(2)max]).

RESULTS

Of 87 patients identified, 47 met the inclusion criteria, and 28 were tested prospectively. Age at the time of lobectomy ranged from 3 days to 56 months. There was no correlation between age at lobectomy and pulmonary function (total lung capacity, P = .408; forced vital capacity, P = .319; forced expiratory volume in 1 second, P = .174) or maximal work capacity (power, P = .280). There was a trend toward lower Vo(2)max in patients who had undergone lobectomy at an older age (Vo(2)max, P = .055).

CONCLUSION

Most children undergoing lobectomy have normal long-term pulmonary function. We found no correlation between age at lobectomy and future pulmonary function. Cardiopulmonary exercise testing should be considered in evaluating functional outcome in these patients.

Is radical lobectomy required in congenital cystic adenomatoid malformation?

BACKGROUND

The extent of surgical resection in the management of congenital cystic adenomatoid malformation (CCAM) located in 1 pulmonary lobe remains controversial. Although lobectomy seems to be the best treatment to avoid recurrent pulmonary infection and neoplasia, neither retrospective nor prospective studies have been done to our knowledge. Besides, many reports claim that there are advantages of parenchyma-saving resections. The aim of our study was to determine whether it was necessary to perform an extended resection in these cases.

MATERIALS AND METHODS

We retrospectively reviewed all patients who had undergone a thoracoscopic lobectomy for CCAM located to 1 pulmonary lobe between January 2007 and January 2009. A thoracic radiologist performed a single blind review of all preoperative computed tomographic (CT) scans, mentioning the presence or absence of distant lesions from the main cysts of CCAM within the pulmonary lobe. The pathologist who analyzed the pulmonary lobectomy specimen was aware of the diagnosis but not the CT report.

RESULTS

Twenty-five patients underwent thoracoscopic lobectomy for congenital lung malformations, including 12 with CCAM. All had a positive prenatal sonogram. The median age at surgery was 12 months (range, 2-24 months). The preoperative CT showed only 2 cases with distant lesions within the affected pulmonary lobe, whereas the histologic study of the surgical specimen identified 6 cases. The sensitivity of the CT scan was low, 33%, whereas its specificity was high, 100%. Furthermore, the preoperative CT negative predictive value was 60%. The median time of follow-up was 7.5 months.

CONCLUSION

Adequate treatment of CCAM in children requires a lobectomy because of poor sensitivity and very poor negative predictive value (60%) of the preoperative CT to determine distal adjacent lesions. A prospective study on a larger number of patients is required to confirm these observations.

MUC5AC, cytokeratin 20 and HER2 expression and K-RAS mutations within mucinogenic growth in congenital pulmonary airway malformations

AIMS

  To analyse the expression of several mucins (MUC1, MUC2, MUC3, MUC5AC and MUC6), epidermal growth factor receptor (EGFR), v-erb-b2 erythroblastic leukaemia viral oncogene homologue 2 (HER2), thyroid transcription factor-1 (TTF-1), caudal type homeobox 2 (CDX2) and cytokeratin 20 (CK20), and the presence of mutations of EGFR, KRAS and HER2 in congenital pulmonary airway malformations (CPAM).

METHODS AND RESULTS

  Forty-one cases of CPAM and six pulmonary sequestrations were included. TTF-1 expression was observed in all cases but was not seen in mucinogenic growths in CPAM. CDX2 expression was completely negative. MUC1 expression was noted in 12 (29%) CPAM and in 33% sequestrations. MUC5AC was noted in only five cases (26%) by immunohistochemistry and was found in the mucinogenic proliferations of type 1 CPAM. No immunolabelling was noted for the other mucins. EGFR was expressed variably in almost all cases, while HER2 and CK20 was seen exclusively in the mucinogenic proliferations. All mucinous growths were characterized by KRAS mutations. No EGFR and HER2 gene alterations were identified.

CONCLUSIONS

  KRAS mutations and MUC5AC, CK20 and HER2 expression was seen in all mucinogenic proliferations, supporting the neoplastic nature of these cytologically bland growths. These findings emphasize the importance of complete surgical resection of such lesions.

Prediction of pediatric outcome after prenatal diagnosis and expectant antenatal management of congenital cystic adenomatoid malformation

OBJECTIVE

To determine whether the congenital cystic adenomatoid malformation (CCAM) volume ratio (CVR) is associated with fetal and postnatal outcome after prenatal diagnosis and antenatal expectant management in a provincial tertiary referral center that does not offer fetal surgery.

METHODS

Retrospective cohort of 71 consecutive cases of prenatally diagnosed CCAM meeting study criteria (1996-2004). CVR was calculated on the initial ultrasound at the referral center, and associated with hydrops (Fisher's exact test) and a composite adverse postnatal outcome consisting of death, intubation for respiratory distress, extracorporeal membrane oxygenation, non-elective surgery for symptomatology, or respiratory infection requiring hospital admission (Mann-Whitney test).

RESULTS

A CVR > 1.6 was significantly associated with hydrops (p = 0.003). In addition, the CVR was significantly associated with the composite adverse postnatal outcome (p = 0.004) at a mean age of follow-up of 41 months (range < 1-117 months). For CVR and postnatal outcome, the area-under-the-curve receiver operating characteristic was 0.81 (95% CI 0.69-0.93, p = 0.006), and choosing a CVR cut-off of < 0.56, the negative predictive value was 100% (95% CI 0.85-1.00).

CONCLUSION

In a provincial referral center with antenatal expectant management of CCAM, the CVR was associated with hydrops and postnatal outcome, with a CVR < 0.56 predictive of good prognosis after birth.

Congenital lung anomalies: can we postpone resection?

BACKGROUND/PURPOSE

The management of asymptomatic congenital lung lesions is controversial. It is unclear whether elective resection provides a significant benefit. We sought to determine whether early vs delayed resection of asymptomatic congenital lung malformations resulted in complications.

METHODS

Institutional billing records were queried for patients with lung malformations over a 10-year period. Medical records were reviewed for demographics, type of anomaly, symptoms, management, and procedural or disease-related complications.

RESULTS

Eighty-seven patients were identified. The diagnoses included congenital cystic adenomatoid malformation (41%), bronchogenic cyst (19.3%), sequestration (13.2%), and congenital lobar emphysema (12.0%). Fifty patients were observed for some period. Eleven became symptomatic, and 47 underwent resection at a mean age of 11 months. There was no difference in the type of resection, length of hospitalization, or complication rate between patients who underwent early vs delayed resection. There were no occurrences of malignancy or death.

CONCLUSIONS

In our series, there was no difference in measurable outcomes between early and delayed resection of congenital lung lesions. These data provide some support for a management strategy that might include observation with delayed resection for asymptomatic patients.

Thoracoscopic segmentectomy for treatment of congenital lung malformations

PURPOSE

Congenital lung malformations (CLM) predispose patients to recurrent respiratory tract infections and pose a rare risk of malignant transformation. Although pulmonary lobectomy is the most common treatment of a CLM, some advocate segmental resection as a lung preservation strategy. Our study evaluated lung-preserving thoracoscopic segmentectomy as an alternative to lobectomy for CLM resection.

METHODS

We conducted a retrospective review of patients who underwent thoracoscopic segmentectomy for CLM from 2007 to 2010.

RESULTS

Fifteen patients underwent thoracoscopic segmentectomy for CLM. There were five postoperative complications: three asymptomatic pneumothoraces and a small air leak that resolved without intervention. One patient developed a bronchopulmonary fistula requiring thoracoscopic repair. At follow-up, all patients are asymptomatic. One patient has a small amount of residual disease on postoperative computed tomography (CT), and re-resection has been recommended.

CONCLUSIONS

Thoracoscopic segmentectomy for CLM is a safe and effective means of lung parenchymal preservation. The approach spares larger airway anatomy and has a complication rate that is comparable with that of thoracoscopic lobectomy. Residual disease can often only be appreciated on postoperative CT scan and may require long-term follow-up or reoperation in rare cases. This lung preservation technique is best suited to smaller lesions.

Prospective study of antenatally diagnosed congenital cystic adenomatoid malformations

PURPOSE

Congenital cystic adenomatoid malformations (CCAMs) are increasingly diagnosed in recent years due to the routine usage of antenatal ultrasound. The aim of this study was to present the natural course and outcome of antenatally diagnosed cystic lung diseases, which were prospectively studied.

METHODS

Between the period June 2004 and June 2010, 25 fetuses with suspected CCAMs were seen in a single tertiary maternal fetal unit. One child was excluded as the fetal MRI suggested congenital diaphragmatic hernia. Data were prospectively entered into a database including antenatal and postnatal findings which were then analyzed.

RESULTS

Mean gestational age at the time of diagnosis was 20.8 weeks (range 17-29). Fetal interventions included amnioreduction (n = 2) and fetal thoracocentesis (n = 3) in one child. The mean gestational age at delivery was 38.5 weeks (range 31.6-40.6). None of the mothers underwent termination of pregnancy or spontaneous abortion. All patients underwent postnatal radiological assessment. Of the 24 cases, 5 children were symptomatic in the immediate neonatal period and 19 were asymptomatic. Anatomical surgical resection was undertaken in all symptomatic cases. There was one death in this group due to severe pre-existing pulmonary hypoplasia. Among the 19 asymptomatic cases, 5 children were managed conservatively as the lesions were not significant and the remaining 14 (73%) underwent surgical resection. The mean age at surgery was 11.1 months (range 3.3-34 months). Postnatal pathology confirmed CCAM in all operated cases, except one who had pulmonary sequestration.

CONCLUSION

Antenatally diagnosed CCAMs have an excellent prognosis except in children with a large lesion and associated with lung hypoplasia. Postnatal investigations are required in all cases to confirm the diagnosis. Symptomatic CCAMs require immediate surgery in the neonatal period with a good outcome. Asymptomatic CCAMs can be safely operated between 9 and 12 months of age.

Mucinous adenocarcinoma of the lung in association with congenital pulmonary airway malformation

Congenital pulmonary airway malformation (CPAM) is a rare developmental abnormality of the lung that has been associated with the presence of rhabdomyosarcoma, pleuropulmonary blastoma, and most commonly bronchioalveolar carcinoma (BAC) of the lung. Here, we report the case of an 8-year-old patient who developed KRAS mutation positive stage IV mucinous adenocarcinoma of the lung in association with CPAM. This case reflects the previously recognized progression of CPAM to malignancy and suggests that BAC arising in CPAM may take a more aggressive course than previously recognized.

Prenatal presentation and postnatal management of congenital thoracic malformations

The antenatal finding of a congenital thoracic malformation (CTM) leads to anxiety in the parents and uncertainty as to the optimal management. The antenatal spectrum of CTM includes congenital cystic adenomatoid malformation, sequestration, congenital lobar emphysema, enteric and bronchogenic cysts, and bronchial atresia. Most lesions require no antenatal intervention, and shrink substantially in the third trimester, but if fetal hydrops develops, then antenatal intervention is required, occasionally medical but more usually surgical, because mortality is high. If the baby is symptomatic in the newborn period, then some form of surgical intervention is clearly required. The asymptomatic baby presents a therapeutic dilemma. Advocates of early surgery point to the complications of CTM, which include infection, pneumothorax, bleeding and malignant transformation. Those who are proponents of conservative management retort that some CTM disappear postnatally, and that the complication rate is unknown; many children appear never to need surgery. Furthermore, there is clearcut evidence that excision of a CTM does not totally eliminate the risk of a subsequent malignancy. It is clear that, both antenatally and postnatally, counselling of the family on a case by case basis is needed. The limitations of present evidence should be stressed. Different families will make different decisions about postnatal surgery in an asymptomatic baby. If surgery is performed, morbidity is low, particularly with a video-assisted thoracoscopic (VATS) procedure.

Outcome and treatment in an antenatally diagnosed congenital cystic adenomatoid malformation of the lung

BACKGROUND

The natural history of patients with antenatally diagnosed congenital cystic adenomatoid malformation of the lung (CCAM) is still fully unknown. In symptomatic patients with respiratory distress, an operation is performed during the neonatal period. However, in asymptomatic patients, the optimal timing of the operation remains controversial. During the period from 1977 to 2007, we experienced 14 CCAM patients diagnosed antenatally. Therefore, we investigated the outcome of antenatally diagnosed CCAM patients to clarify the optimal treatment for such patients.

METHODS

Fourteen patients were reviewed regarding the antenatal ultrasonography findings and postnatal clinical course. They were then classified into three groups according to the clinical manifestations. Group A was associated with hydrops fetalis (n = 2), group B had respiratory symptoms just after birth (n = 6), and group C was asymptomatic at birth (n = 6). The postnatal clinical courses in three groups were reviewed.

RESULTS

In group A, all two patients with hydrops fetalis died just after birth. In group B, six patients had a severe respiratory distress and underwent operation during the neonatal period. In group C, five out of six patients were asymptomatic and received elective operation during the early infant period. In the remaining one patient, the lesion spontaneously disappeared over time after birth. The mean age at the time of operation in group B and group C was 4.5 days and 4.5 months of age, respectively. In almost all patients in group C, we performed an operation within the first 6 months. During this observation period, we did not experience any complications associated with CCAM.

CONCLUSION

In patients with hydrops fetalis, fetal intervention is thought to be needed. In patients with asymptomatic CCAM, an elective operation during the early infant period is recommended to prevent the risk of complications associated with CCAM before 6 months of age. In addition, we recommend the performance of a partial lung resection using an axillary skin crease incision in order to obtain a good postoperative quality of life.