Analysis of Recurrent Sacrococcygeal Teratoma in Children: Clinical Features, Relapse Risks, and Anorectal Functional Sequelae

Relapse and survival after relapse among children with cancer in Denmark: 2001-2021

BACKGROUND

In recent decades, new first and subsequent lines of anticancer treatment and supportive care have improved survival for children with cancer. We investigated recent temporal changes in the incidence of relapse and survival after relapse among children with cancer in Denmark.

PROCEDURE

This register-based study included 2890 children diagnosed before age 15 years with haematological cancers and solid tumours (2001-2021) and central nervous system (CNS) tumours (2010-2021). We used the Aalen-Johansen and Kaplan-Meier estimators to assess cumulative incidence of relapse-defined as cancer recurrence or progression-and survival probability after relapse.

RESULTS

Comparing the periods 2001-2010 and 2011-2021, the 5-year cumulative incidence of relapse decreased from 14% to 11% among children with haematological cancers (p = .07), and from 21% to 18% among children with solid tumours (p = .26). Concurrently, the 5-year survival after relapse increased among children with haematological cancers (from 44% to 61%, p = .03) and solid tumours (from 38% to 46%, p = .25). Among children with malignant CNS tumours, the 5-year cumulative incidence of relapse and the 5-year survival after relapse remained stable (49% and 51%, p = .82; and 20% and 18%, p = .90) comparing 2010-2015 and 2016-2021.

CONCLUSIONS

In recent decades in Denmark, improvements were observed in reducing relapse incidence and increasing survival after relapse in children with haematological cancers and solid tumours. However, the persistent survival gap between children who relapse and those who do not across all childhood cancers underlines the need for intensified and highly targeted treatments for children at high risk of relapse.

Early Outcomes of the Surgical Treatment of Sacrococcygeal Tumors in a Tertiary Level Government Hospital

Objectives

Sacrococcygeal teratomas (SCT) are the most common extragonadal tumors of early childhood. Their clinical characteristics and outcomes of patients with sacrococcygeal tumors who underwent excision in the Philippines has never been described, while numerous retrospective studies have been conducted in other countries.

Methods

This was a retrospective, descriptive study over a four-year period (December 2014 to November 2018). The study described the patients' demographic data, manner of delivery, clinical presentation, prenatal diagnosis of tumor, Altman classification, and alpha fetoprotein levels. These information were obtained from the medical records of the patients. Additional data from the operative technique include the surgical approach, size of the mass, and gross involvement of adjacent structures and the final histopathologic results. Outcomes include the 30-day mortality and morbidity, and tumor recurrence.

Results

A total of 29 patients were included in the study with 22 females (75.86%) and seven males (24.14%). Twenty-five out of the 29 (86.21%) had a sacral or gluteal mass at birth while other presenting factors include a palpable abdominal mass (1), constipation (1), difficulty in urination (1), and an elevated AFP in one postoperative patient. Even if 27 out of the 29 patients underwent a maternal ultrasound, only three patients (10.34%) had a correct ultrasound interpretation of sacrococcygeal teratoma. Age at presentation was problematic, with 12 presenting at greater than one year of age while 10 were brought for consultation at greater than one month old. Only seven presented at the neonatal period. CT scan was the most common imaging tool utilized (37.93%), followed by ultrasound (27.59%). AFP was elevated in ten patients (34.48%). Six of the patients with elevated AFP had mature teratoma, two had yolk sac tumor, one had fibroepithelial polyp, and one was post chemotherapy but had mature teratoma based on the final histopathology report. Fifteen out of the 29 patients had Altman type I tumors (51.72%), seven (24.14%) had type II tumors, six (20.69%) had type III tumors, and only one patient had type IV tumor. Sacral approach in the excision of the sacrococcygeal tumor was performed in 25 patients (86.21%). There was no reported perioperative mortality for patients who underwent surgery for SCT during the study period. Twelve out of the 29 had postop morbidities, three with surgical site infection and three with rectal or vaginal perforation. Five patients had tumor recurrence occurring from two months to three years postoperatively.

Conclusion

Early detection of sacrococcygeal teratomas even in the prenatal period is the norm in certain areas of the world, but in our country, prenatal detection is still a challenge. Even if the majority of the patients presented with a gluteal mass at birth, less than a third were brought to our tertiary government hospital in neonatal life. The sacral approach for SCT excision was employed for the great majority of our patients, but due to the advanced age at diagnosis and locally advanced disease, morbidities occurred in about a third of the patients. Therefore, early detection prenatally and early referral to a pediatric surgical center should be achievable goals for physicians dealing with these patients.

Pregnancy and Long-Term Postnatal Outcomes of Congenital Sacrococcygeal Teratoma: A Single Institution's 18-Year Experience

OBJECTIVE

The objective of this study is to evaluate outcomes of fetal sacrococcygeal teratoma (SCT) from an academic tertiary center.

STUDY DESIGN

This is a retrospective study evaluating pregnancy and postnatal outcomes of fetal SCT management at a single institution between 2006 and 2023. Results are reported as median (range).

RESULTS

Fourteen patients with fetal SCT were studied. Hydrops fetalis occurred in 2 (14.3%) cases. Pregnancy course included expectant management in 12 (85.7%) and palliative preterm induction in 1 patient (7.1%). Indications for delivering timing included fetal deterioration in 7 patients (50%), preeclampsia in 3 (21.4%), elective induction of delivery in 3 (21.4%), and preterm labor in 1 (7.1%). Delivery GA was 36.4 weeks (26.4-40.1 weeks), with 11 (78.5%) cesareans and 3 (21.4%) vaginal deliveries. There were 13 (92.9%) live births and 11 (78.6%) long-term survivors. Postnatal resection pathology demonstrated 7 (53.8%) mature, 3 (23.1%) immature, and 3 (23.1%) malignant SCTs. Of the 11 long-term survivors, 3 (27.3%) had teratoma recurrences, including 2 (18.2%) with metastatic disease requiring chemotherapy. Notable long-term complications involved gastrointestinal (n = 7, 63.6%), genitourinary (n = 4, 36.4%), and musculoskeletal (n = 2, 18.2%) systems.

CONCLUSION

SCT confers significant morbidity to both the pregnant patient and neonate. Multidisciplinary prenatal and postnatal care is needed to comprehensively manage this complex condition.

Variability in Surveillance Strategies Following Resection of Sacrococcygeal Teratoma

INTRODUCTION

Surveillance following sacrococcygeal teratoma (SCT) resection varies. The purpose of this study was to describe the clinical characteristics and outcomes of patients undergoing SCT resection and examine current institutional practices to detect recurrence.

METHODS

A single-institution retrospective review of children who underwent resection of an SCT from January 1, 2010 to December 31, 2020 was performed. Data were summarized and surveillance strategies compared between histopathologic subtypes using nonparametric methods.

RESULTS

Thirty six patients (75.0% female) underwent SCT removal at a median age of 8 d. Histopathology revealed 27 mature teratomas (75.0%), eight immature teratomas (22.2%), and one malignant germ cell tumor (2.8%). Median postoperative follow-up was 3.17 y (interquartile range [IQR]: 2.31-4.38 y). Patients had a median of 2.32 clinic visits per year (IQR: 2.00-2.70), alpha-fetoprotein levels were obtained at a median of 2.01 times per year (IQR: 0-1.66), and surveillance imaging was performed at a median of 2.31 times per year (IQR: 0-2.84). Patients with immature teratomas had alpha-fetoprotein laboratories obtained more frequently than patients with mature teratomas (3.10 times/year versus 0.93 times/year, P = 0.001). There was no significant difference in the number of imaging studies obtained between groups. Two patients (5.6%) developed recurrence, which were identified on magnetic resonance imaging at 191 and 104 d postresection, respectively.

CONCLUSIONS

Postoperative surveillance practices varied widely. Recurrence was noted in a single malignant case in the first year following resection. Multi-institutional studies are needed to determine the optimal surveillance strategy to detect recurrence of SCT.

Sacrococcygeal teratomas: a case-based review from the perspective of individual multidisciplinary experts

PURPOSE

Sacrococcygeal teratoma (SCT) is a rare congenital tumor originating from a variant of extragonadal germ cell neoplasm. Herein, we present three cases of neonatal SCTs undergoing surgical resection and reconstruction. We also review the literature to discuss the importance of proper perinatal management and timely surgical intervention depending on the tumor type and maturity to prevent malignant transformation and recurrence and ensure functional outcomes.

METHODS AND RESULTS

Three cases of SCT were retrospectively analyzed. All infants underwent complete surgical resection of the SCT and coccygectomy during their neonatal/infancy period, followed by pelvic floor and buttock reconstruction while minimizing buttock contour deformity and undesirable skin scar. Two of the cases were histopathologically diagnosed as predominantly cystic mature teratomas of Altman types I and IV, and the third was a mature teratoma of Altman type II. There were no complications or tumor recurrence during the average follow-up period of 5.3 years.

CONCLUSIONS

This case-based review highlights the role of multidisciplinary team approaches, including prenatal monitoring, oncologic resection, and adequate reconstruction according to the type of tumor and anomaly. Optimal perinatal evaluation allows promising oncologic and functional outcomes in terms of timely intervention to eliminate tumor recurrence and malignant transformation. Complete oncologic surgical resection of SCTs should also include proper functional preservation strategies, such as the reconstruction of the pelvic floor, cosmetic buttock contouring, and preservation of bladder and bowel sphincter function.

A nomogram for predicting recurrence-free survival of intermediate and high-risk neuroblastoma

This study aimed to confirm the independent risk factors for recurrence-free survival (RFS) in intermediate and high-risk neuroblastoma (NB) patients and set up an effective nomogram model for predicting the recurrence of NB. A total of 212 children with intermediate- and high-risk neuroblastoma, who had ever achieved complete remission (CR) or very good partial remission (VGPR) after standardized treatment in this hospital, were chosen as study objects. After retrospective analysis of the clinical data, Cox regression model was used to explore the factors related to the recurrence of neuroblastoma, to determine the variables to construct the Nomogram. The consistency index would predict the accuracy of this nomogram. RFS rate in 1-year, 3-year, 5-year, and 10-year was 0.811, 0.662, 0.639, and 0.604, respectively. Children with MYCN amplification had a higher neuron-specific enolase (NSE) value (P = 0.031) at the initial diagnosis than MYCN non-amplification. The univariate analysis predicted that increased vanillylmandelic acid (VMA) and NSE value and dehydrogenase (LDH) > 1000 U/L were important adverse factors for the recurrence of NB. Multivariate analysis demonstrated that age at diagnosis, tumor localization, MYCN state, histologic subtype, and tumor capsule were significantly associated with RFS (all P values < 0.05). Nomograms were established for predicting the recurrence of NB according to the Cox regression analysis. Internal verification by the Bootstrap method showed that the prediction of the nomogram's consistency index (C-index) was 0.824 (P = 0.023).   Conclusion: Age at diagnosis, tumor localization, MYCN state, histologic category, and tumor capsule were independent risk factors for the recurrence of NB. The nomogram model could accurately predict the recurrence of children with neuroblastoma. What is Known: • The prognoses of neuroblastoma (NB) could vary greatly due to the high heterogeneity, the 5-year survival rate of low-risk NB exceeded 90%, while the 5-year survival rate of children in the intermediate and high-risk groups was not satisfactory.. What is New: • Increased vanillylmandelic acid (VMA) and neuron-specific enolase (NSE) value, and lactate dehydrogenase (LDH)>1000U/L were important adverse factors for the recurrence of NB. • NSE value was more valuable for predicting NB recurrence.

Sacrococcygeal teratomas: midline reconstruction improves cosmesis without compromising outcomes

AIM

Several studies have addressed the long-term functional, psychosexual and psychosocial outcomes following sacrococcygeal teratoma (SCT) excision. It is well reported that the classical chevron incision and reconstruction can leave a cosmetically unsatisfactory result; however, there is little in the literature focussed on improving this outcome. In our institution the preference is to perform a midline reconstruction, where possible, this is felt to improve appearance without compromising the oncological or functional outcome. The aim of this study was to evaluate patient-perceived cosmetic outcomes of the midline reconstruction.

METHODS

All patients undergoing surgery for SCT between 2007 and 2020 were included in the study. Patient demographics, operation type, functional outcome and recurrence were all recorded. The primary outcome measure was patient/parent satisfaction with the cosmetic appearance. This was assessed using both qualitative and quantitative methodologies. Following ethical approval parents were asked questions from two existing validated patient outcome questionnaires: "Patient and Observer Scar Assessment Scale" (POSAS) v2.0 and the "Patient Scar Assessment Questionnaire".

RESULTS

Thirty-two patients underwent surgery at our institution for SCT during the study period. Twenty-four had a posterior approach with midline reconstruction, two laparotomy and excision (excluded from this study) and six had a combined approach. Median follow-up was 35 months (8.5-96 months). There were no recurrences. 4/30 (13%) have persistent urological symptoms, and 1/30 (3%) has constipation requiring bowel management. Questionnaires were sent to 26/30 families with a 77% return rate. Median total score was 11 (7.4-17.5) on a 60-point scale (6, as normal skin, 60, worst imaginable scar). Twenty (95%) reported that the scar never affects the child's activities and 15 (71%) said they are "not at all" conscious of the scar.

CONCLUSION

Scars can lead to an array of cosmetic, functional, and psychological consequences and as such consideration needs to be given to scarring following surgery for sacrococcygeal teratomas. This study demonstrates that a midline reconstruction produces a cosmetically favourable outcome. We, therefore, recommend where appropriate a midline reconstruction should be considered for SCT.

International Society of Paediatric Surgical Oncology (IPSO) Surgical Practice Guidelines

Most children with tumors will require one or more surgical interventions as part of the care and treatment, including making a diagnosis, obtaining adequate venous access, performing a surgical resection for solid tumors (with staging and reconstruction), performing procedures for cancer prevention and its late effects, and managing complications of treatment; all with the goal of improving survival and quality of life. It is important for surgeons to adhere to sound pediatric surgical oncology principles, as they are closely associated with improved local control and survival. Unfortunately, there is a significant disparity in survival rates in low and middle income countries, when compared to those from high income countries. The International Society of Paediatric Surgical Oncology (IPSO) is the leading organization that deals with pediatric surgical oncology worldwide. This organization allows experts in the field from around the globe to gather and address the surgical needs of children with cancer. IPSO has been invited to contribute surgical guidance as part of the World Health Organization Initiative for Childhood Cancer. One of our goals is to provide surgical guidance for different scenarios, including those experienced in High- (HICs) and Low- and Middle-Income Countries (LMICs). With this in mind, the following guidelines have been developed by authors from both HICs and LMICs. These have been further validated by experts with the aim of providing evidence-based information for surgeons who care for children with cancer. We hope that this initiative will benefit children worldwide in the best way possible. Simone Abib, IPSO President Justin T Gerstle, IPSO Education Committee Chair Chan Hon Chui, IPSO Secretary.

Malignant recurrence after mature Sacrococcygeal teratoma: A meta-analysis and review of the literature

BACKGROUND AND AIMS

Sacrococcygeal teratoma (SCT) is a rare extragonadal germ cell tumour mostly diagnosed during infancy and early childhood. Neonatal SCTs are mostly mature, but can also contain immature and/or malignant components. Recurrence of an SCT alters prognosis, especially when it is malignant, of which its mechanism is not yet fully understood. This study is a review and meta-analysis of the literature on malignant recurrences after an initially mature SCT.

METHODS

A literature search was performed to identify studies describing children with SCT and presenting specific information on histology of the initial tumour as well as the recurrence. Random effect models for mature recurrence and malignant recurrence after an initially mature SCT were employed to pool study-specific percentages in order to estimate an overall percentage and its associated 95 % confidence intervals (CI). Inverse variance method, which gives more weight to larger studies, was used to pool outcomes for the different studies.

RESULTS

A total of 22 articles, comprising 1516 patients with SCT, were included in the meta-analysis. The pooled proportions of mature and malignant recurrences after mature SCT were 3 % (95 % CI 1-4 %) and 5% (95 % CI 3-6 %), respectively. Fifty-seven (56 %) of a total of 102 recurrences after resection of an initially mature SCT were malignant, mostly yolk sac tumour (YST). Many recurrences occurred within 1-6 years, however some occurred as long as 20 years after initial diagnosis.

CONCLUSIONS

A substantial number of recurrences of mature SCT present as a malignant tumour. Overlooking malignant components on initial pathological evaluation and the progression of mature SCT cells to malignant cells may play a role. Treatment of mature SCTs with resection alone requires thorough follow-up of at least 6 years. Future research is needed to determine whether SCTs with malignant microfoci should be treated or followed-up differently from mature or immature SCTs. In addition, the value of serum biomarkers in follow-up after SCT needs to be further evaluated.

Sacrococcygeal teratoma with intraspinal extension: A case series and review of literature

BACKGROUND

Sacrococcygeal teratoma (SCT) is the most common teratoma in neonates and arises from the coccyx. SCT with intraspinal invasion is extremely rare and only reported in a few cases.

METHODS

37 patients with SCT were identified at our institution between 2000 and 2018. Three of these patients had SCT with intraspinal extension. A literature review for intraspinal extension associated with SCT, including mode of diagnosis, presentation, surgical approach and neurological sequelae, between 1993 and 2018 was also conducted.

RESULTS

The authors report three cases of infants who were antenatally and/or postnatally diagnosed with a sacrococcygeal teratoma extending into the spinal canal. We illustrate the challenges of accurate diagnosis and therapeutic management. Postnatal magnet resonance imaging (MRI) was the best method to define spinal anatomy and extension of the tumors prior to surgery. Management with a multidisciplinary team approach including neuroradiology, neurosurgery and general surgery was used in our two most recent patients. The literature review yielded 6 cases of SCT with intraspinal extension.

CONCLUSION

Intraspinal extension in SCT is rare but should be excluded at birth before attempting any resection. In case of positive spinal invasion on Ultrasonography (US), MRI is essential to plan for surgery and possible laminectomy to be able to perform a radical resection of this congenital tumor. We recommend this multidisciplinary approach.

LEVEL OF EVIDENCE

Level IV.

Diagnostic accuracy of serum alpha-fetoprotein levels in diagnosing recurrent sacrococcygeal teratoma: A systematic review

BACKGROUND

The incidence of children developing recurrent sacrococcygeal teratoma (SCT) is 2-35%. Serum alpha-fetoprotein (AFP) is often used as a tumor marker for (malignant) recurrences of SCT and could potentially be used during routine follow-up after SCT resection. However, the diagnostic accuracy of serum AFP levels during follow-up has not been well established. Therefore, we aimed to systematically review the diagnostic accuracy of serum AFP levels in recurrent SCT.

METHODS

We queried Search Premier, COCHRANE Library, EMCARE, EMBASE, PubMed, ScienceDirect and Web of Science databases to identify studies regarding patients with SCT with follow-up using serum AFP levels postoperative. We estimated sensitivity and specificity of serum AFP levels.

RESULTS

Fifteen studies (613 patients, 121 recurrences) were included and these mainly described serum AFP levels in patients with recurrent SCT (n = 111); 83 (75%) patients with recurrent SCT had elevated serum AFP levels. A subgroup analysis of articles that measured serum AFP levels in all patients (n = 6, 136 patients, 14 recurrences) showed a sensitivity and specificity of 79% and 95%, respectively. The sensitivity of AFP levels to detect malignant recurrence was 96%.

CONCLUSION

Diagnostic accuracy of serum AFP levels to detect recurrent SCT seems promising, though sensitivity could be overestimated since serum AFP levels are mainly described in patients with elevated AFP levels or at recurrent SCT. Furthermore, serum AFP levels could be helpful to detect malignant recurrences.

TYPE OF STUDY

Systematic review of level 2-4 studies.

LEVEL OF EVIDENCE

Level 2-4 (mostly level 2).

Presacral masses and sacrococcygeal teratomas in patients with and without anorectal malformations: A single institution comparative study

BACKGROUND

Despite variability at presentation, presacral masses in patients with and without anorectal malformations (ARM) appear histologically similar. The purpose of this study was to identify differences in oncologic outcomes between these two groups.

METHODS

A retrospective review was performed utilizing our institutional cancer and colorectal and pelvic reconstruction databases for patients with presacral masses and sacrococcygeal teratomas between 1990 and 2017. Data captured included age at surgical resection, type of ARM, tumor location within the pelvis, tumor histopathology, tumor size, adjuvant chemotherapy, recurrence, and follow-up.

RESULTS

Forty-six patients comprised our cohort, of whom 12 had an ARM. The median age was older at resection for those with an ARM (1.4 years; range 1 day to 29.4 years) compared to those without an ARM (9 days; range 0 days to 6.9 years) (p = 0.01). The mean tumor size was 2.5 cm in patients with an ARM compared to 6.0 cm in patients without an ARM (p = 0.036). All patients with ARM had exclusively intrapelvic tumors, and histopathology included mature teratoma (8), yolk sac tumor (1), lipoma (1), and unknown (2). Tumor location for patients with sacral and presacral masses without ARM included exclusively extrapelvic (10), primarily extrapelvic with large intrapelvic component (7), primarily intrapelvic with extrapelvic component (1), exclusively intrapelvic (8), and unknown (8). Histopathology for patients with presacral masses without ARM included mature teratoma (20), immature teratoma (7), yolk sac tumor (3), ganglioneuroma (1), neuroblastoma (1), benign epithelial cyst (1), and unknown (1). Tumor recurrence rate was similar between patients with ARM (n = 3, 25%) and those without an ARM (n = 5, 15%) (p = 0.41). The 5-year event free survival was 65% (95% CI: 25%-87%) in the group with ARM and 81% (95% CI: 60%-92%) in the group without ARM (p = 0.44).

CONCLUSION

Sacral and presacral masses in patients with ARM are resected at a later age and are more likely to be intrapelvic. They appear histologically similar and have similar rates of recurrence and malignancy when compared to patients without ARM.

LEVEL OF EVIDENCE

III TYPE OF STUDY: Retrospective comparative study.

Sacrococcygeal Teratoma Presenting with Vaginal Discharge and Polyp in an Infant

BACKGROUND

Sacrococcygeal teratoma accounts for the most common solid tumor in neonates. Because of improved technology, 50%-70% of cases can be diagnosed antenatally during routine ultrasound screenings. If not diagnosed antenatally, clinical findings at birth are distinct in most cases including a palpable or visible mass.

CASE

We report an unusual case of a 1-year-old girl who presented with persistent vaginal discharge leading to diagnosis of a mucosal polypoid lesion of the vagina, ultimately revealing a hidden sacrococcygeal teratoma.

SUMMARY AND CONCLUSION

We suggest thorough investigation of all infants who present with purulent discharge and recurrent vaginal mass; sacrococcygeal teratoma should routinely be considered as a differential diagnosis.