Management of fetal teratomas

Gonadal Teratomas: A State-of-the-Art Review in Pathology

Teratomas are neoplasms arising from germ cells and encompass tissues derived from two or more embryonic germ layers, including ectoderm, mesoderm, and endoderm. These tumours typically localize along the midline or in paramedian positions and can manifest as gonadal (20%) or extragonadal (80%) entities. Although gonadal teratomas are uncommon, they represent the predominant type of gonadal tumour in the paediatric population. They comprise approximately 20-25% of all ovarian tumours in females and about 3-5% of all testicular tumours in males. Ovarian teratomas exhibit a higher incidence in early childhood and adolescence, whereas testicular teratomas are more prevalent during the first three months of life and between the ages of 15 and 19. While the majority of paediatric gonadal teratomas are benign, malignant or mixed variants may also arise, necessitating more aggressive therapeutic interventions.

Perinatal Outcomes of Intrauterine Interventions for Fetal Sacrococcygeal Teratoma Based on Different Surgical Techniques-A Systematic Review

Background: This study aims to evaluate the outcomes of fetal sacrococcygeal teratoma (SCT) submitted to prenatal interventions. Methods: We performed a systematic literature review of fetal SCT patients and compared the outcomes between open fetal surgery and percutaneous intervention. In addition, we also compared the results of SCT fetuses who did not undergo any surgical intervention (NI). Results: We identified 16 cases of open fetal surgery (OS), 48 cases of percutaneous fetal intervention (PI), and 93 NI patients. The survival rate was 56.2% in OS, 45.8% in PI (p = 0.568), and 71.0% in NI patients. The gestational age at delivery was earlier in cases where there was no survival compared to cases where the fetuses did survive across all evaluated cohorts (OS: p = 0.033, PI: p < 0.001, NI: p < 0.001). The gestational weeks at delivery in OS and PI fetuses were more similar; however, OS tended to be performed later on in pregnancy, and the affected fetuses had more severe presented findings. In our evaluation, we determined that the presence of fetal hydrops and cardiac failure had no significant impact on survival in SCT cases. In NI patients, polyhydramnios was much higher in fetuses who did not survive compared to their surviving cohorts (p < 0.001). Conclusions: In conclusion, gestational age at delivery can affect the short-term prognosis of fetuses affected with sacrococcygeal teratomas. Regardless of the mode of delivery or the necessity for intervention during the fetal period, monitoring for complications, including polyhydramnios, can prevent premature delivery.

Infantile fetiform abdominal mass: Teratoma or fetus in fetu? A case report with insights into radiological diagnosis and surgical management

Fetus-in-fetu (FIF) is a rare congenital anomaly in which a malformed parasitic twin develops within the body of a live fetus or child. Abdominal teratoma, a type of germ cell tumor, can be a great imaging mimicker of FIF and vice-versa, as they both can present as a heterogeneous mass with calcifications and a fat component. Radiological differentiation of these 2 entities should be made because of the difference in surgical planning and treatment options. Features such as visualization of distinct bony vertebral elements and encysted cystic components are the specific features of Fetus in fetu [1]. In contrast, the presence of elevated serum markers can help diagnose teratoma. Here, we report a case of a 5-month-old girl presented with progressive distension of the upper abdomen for the last 2 months, noticed by her mother. Her initial imaging with abdominal X-ray and ultrasonography showed the presence of a large heterogenous solid-cystic mass in the upper abdomen with large elongated calcifications. A provisional diagnosis of teratoma vs FIF was considered. CECT abdomen showed clear identification of osseous structures of the axial and appendicular skeleton within a fat density mass, along with an encapsulated cystic component, strongly suggestive of FIF. Her serum tumor markers were within normal limits. The final diagnosis of FIF was confirmed on Laparotomy and postoperative specimens.

Immature Sacrococcygeal Teratoma: A Case Report and Extensive Review of the Literature

Immature sacrococcygeal teratoma represents a histological form with rapid tumor growth, a risk of premature birth, an enhanced rate of complications, an increased risk of recurrence, and a higher mortality rate than the mature type. Thus, prenatal diagnosis of immature forms would significantly improve the prognosis of these cases. To this end, we performed an extensive literature review on the diagnosis, therapeutic management, and follow-up of immature teratomas. Regarding this medical conduct, we also presented our case. In conclusion, the early identification of immature sacrococcygeal teratomas with or without other associated structural abnormalities and their correct therapeutic approach are basic principles for a favorable evolution of these cases.

Prenatal Diagnosis of Oral Teratoma by Ultrasound

A pregnant woman had a normal second-trimester anatomic survey at 22 weeks gestation. She was revealed to have a fetal oral mass with polyhydramnios and invisible stomach bubble by ultrasound at 28 weeks. A 50 mm × 36 mm × 42 mm, solid mass was found in the fetal mouth, filling the entire oral cavity. Fetal magnetic resonance imaging showed a homogeneous solid mass in the oral cavity compressing the hypopharynx. At 33 weeks, preterm labor occurred because of the continuation of increased amniotic fluid volume, and a female infant was vaginally delivered. The infant died shortly after tracheal intubation attempt failed. Autopsy confirmed the prenatal sonographic finding. The final pathologic diagnosis was oral immature teratoma. Our study indicates that although oral teratomas are rare, they are readily apparent at prenatal sonographic examinations. Respiratory compromise is the frequent complication of oral teratomas, which is associated with high perinatal mortality.

Approach and Technique for Cesarean Section to Immediate Resection for High-Risk Sacrococcygeal Teratomas

INTRODUCTION

Ex-utero intrapartum treatment has been established as an option for fetal and perinatal surgeons to deliver patients with sacrococcygeal teratomas (SCTs) which are causing significant fetal distress and possible in-utero fetal demise. However, ex-utero intrapartum treatment procedures carry significant maternal risk and morbidity. Herein, we report an alternative technique of Cesarean section to immediate resection (CSIR) for managing high-risk SCTs.

METHODS

A retrospective institutional review board-approved review was performed on all SCTs evaluated at our fetal center from May 2014 to September 2020. Demographics; prenatal imaging characteristics; prenatal interventions; and postnatal surgery data including operative time, estimated blood loss, pathology, and outcomes were collected. Outcomes of interest included surveillance serum alpha-fetoprotein levels, imaging surveillance, developmental milestones, and the presence or absence of constipation or fecal incontinence.

RESULTS

A total of 20 patients with prenatal diagnosis of SCT were evaluated. Mothers who transferred their care to another institution after diagnosis were excluded from this study. Twelve neonates underwent standard postnatal resection. Three neonates underwent emergent CSIR for high output cardiac failure, fetal anemia, or concerns for in-utero hemorrhagic rupture. The median (interquartile range) operative time was 231.5 (113) minutes for the standard operative group versus 156 min in the CSIR group. We present three patients who underwent immediate resection after emergent Cesarean section. We report 100% survival for the three consecutive cases.

CONCLUSIONS

CSIR is a safe and feasible approach for managing appropriately selected high-risk SCTs with signs of hydrops, fetal distress, or fetal anemia. Despite patient prematurity, we demonstrated 100% survival of three consecutive cases. We suggest that CSIR be considered an option in the management algorithm for high-risk SCTs.

Mature Triphyllic Cystic Teratoma of the Posterior Mediastinum in a Fetus: A Case Report and Literature Review

A teratoma is a neoplasm composed of cell populations or tissues that are reminiscent, in their appearance, of normal elements derived from at least two embryonic layers. Fetal mature teratomas are normally benign, cystic, and typically occur along the midline, while they are rare in the posterior mediastinum. Teratomas are frequently solitary; however, they may sometimes be associated with other congenital anomalies and/or with chromosomal abnormalities. Clinically, they are often asymptomatic but can occasionally cause compression symptoms. Prenatal diagnoses are uncommon and made with ultrasonography; differential diagnosis with other congenital conditions is mandatory. We report the case of a 21 weeks of gestational age old fetus with a mature triphyllic fetal cystic teratoma, grade 0, located in the right posterior mediastinum. The tumor presented as a 3 cm wide cystic mass that caused a contralateral shift of the surrounding structures. Histological examination later revealed the presence of derivatives of the three germ layers, such as hyaline cartilage, smooth muscle, nervous tissue, and a respiratory-type epithelium.

Prenatal MRI diagnosis and outcomes of abdominal or sacrococcygeal teratomas and parasitic fetuses

Objective

To investigate the MRI findings of fetal abdominal or sacrococcygeal teratomas and parasitic fetuses and analyze the outcomes on the basis of follow-up assessments.

Methods

The MRI data of 60 cases of abdominal or sacrococcygeal masses were examined. The outcomes were followed up and compared with the prenatal MRI diagnoses.

Results

The 60 cases included 52 cases of sacrococcygeal teratomas and eight cases of abdominal lesions. The common types of sacrococcygeal teratomas were type I (21/52, 40.4%) and type II (20/52, 38.5%); type III sacrococcygeal teratomas were rarer (8/52, 15.4%), while type IV tumors (3/52, 5.7%) were frequently complicated with hydronephrosis. Other complications included polyhydramnios in 22 cases, placental edema in six cases, and fetal hydronephrosis in three cases (all type IV). Seven of the eight parasitic fetuses were located in the abdominal cavity, and one was located in the sacrococcygeal region. Postnatal surgery was performed in 51 cases (51/60), including 44 with teratomas and seven with parasitic fetuses. In one case with hydronephrosis, peritoneal effusion, and subcutaneous edema, treatment was discontinued after birth (1/60). Fetal induction of labor was observed in eight cases (8/60). Prenatal ultrasound yielded incorrect or ambiguous diagnoses in 11 cases, while 51 cases showed a favorable course after surgery.

Conclusions

MRI shows high accuracy in the diagnosis of fetal sacrococcygeal teratomas and parasitic fetuses. The prognosis in these cases is generally good. However, type IV sacrococcygeal teratomas are prone to fetal hydronephrosis and misdiagnosis and show a poorer prognosis.

Giant Sacrococcygeal Teratoma in a Neonate: A Case Report

Sacrococcygeal teratomas are common tumours in neonates and infants, primarily affecting females. A 35-year-old primigravida presented with a large sacrococcygeal teratoma that was detected during the 30th week of gestation in the fetus. The baby was delivered via elective caesarean section at 36+3 weeks, and surgical excision of the 10x10x5 cm³ mass was performed successfully on the third day of life. Despite a surgical site infection, the patient had a favourable outcome with normal vital signs, bowel, bladder, and lower extremity functions upon discharge. Early diagnosis and prompt management of sacrococcygeal teratoma in newborns is vital for optimal outcomes, providing valuable insights and guidance to medical practitioners.

Keywords

anaesthesia; case reports; neonate; teratoma.

Fetal Sacrococcygeal Teratoma: A Case Report of a Giant Tumor withan Excellent Outcome

Sacrococcygeal teratoma (SCT) occurs in approximately 1 per 20,000-40,000 births and is the most frequently encountered fetal teratoma, with 75% of cases observed in female fetuses. SCT can be detected on ultrasound as early as the first trimester, presenting as a large mass originating from the sacrococcygeal area, with or without an intrapelvic component. The prenatal course for most fetuses with SCT is generally uneventful, with only a few cases experiencing obstetric and fetal complications. We present the case of a 19-year-old woman who was in good health and had no relevant family or medical history. She was gravida 2 and para 1. During the first trimester scan, an examination revealed a heterogeneous mass in the presacral area with a predominantly multicystic appearance, measuring 12 mm in diameter. At 21+6 weeks of gestation, the Type 2 fetal SCT showed an increase in volume with the size of 49×37×36 mm and contiune to increase in size. The male fetus was delivered by elective Cesarean section at 38 weeks of gestation. The resection of the tumor and coccyx was performed when the newborn was 7 days old. The tumor measured 190×160×100 mm and weighed 1100 g. Pathological examination confirmed the diagnosis of a mature teratoma (Grade 0), and the resection margins were negative. Our case report highlights a fetus with a large and rapidly growing SCT, yet the outcome was excellent.

Imaging of pediatric extragonadal pelvic soft tissue tumors: A COG Diagnostic Imaging Committee/SPR Oncology Committee White Paper

The most common pediatric extragonadal pelvic cancers include germ cell tumors, sacrococcygeal teratomas, and rhabdomyosarcomas (arising from the urinary bladder, prostate, paratesticular tissues, vagina, uterus, and perineum). This paper describes the radiological and nuclear medicine features of these entities and provides consensus-based recommendations for the assessment at diagnosis, during, and after treatment.

Common benign primary pediatric cardiac tumors: a primer for radiologists

Cardiac tumors are neoplasms arising from or located in the heart or the pericardium. Although rare, primary cardiac tumors in children require an accurate and timely diagnosis. Most pediatric primary cardiac tumors are benign (around 90%). Echocardiography is the first imaging modality used due to its availability, noninvasiveness, inexpensiveness, and absence of ionizing radiation. Computed tomography (CT) and magnetic resonance imaging (MRI) offer better soft tissue visualization as well as better visualization of extracardiac structures. A great advantage of MRI is the possibility of measuring cardiac function and blood flow, which can be important for obstructing cardiac tumors. In this article, we will offer a brief review of clinical, echocardiographic, CT, and MRI features of cardiac rhabdomyomas, fibromas, teratomas, and lipomas providing their differential diagnosis.

Sacrococcygeal teratoma: evaluation of its approach, treatment and follow-up in two reference children cancer centers in Brazil / Rio de Janeiro

INTRODUCTION

sacrococcygeal teratoma (TSC) is the most common tumor of the neonatal period. Alphafetoprotein is an important tumor marker and is used in the follow-up period as a marker of malignancy. The complete surgical resection of the tumor associated with coccygectomy is the standard treatment and chemotherapy in different stages are necessary. Follow-up consists of serial exam: tumor markers, imaging searching to possible metastasis sites, in addition to a complete physical examination.

METHODOLOGY

a descriptive, retrospective, study was carried out by analyzing a chart of 25 patients of two different reference children cancer center; with TSC in the State of Rio de Janeiro from 2004 to 2019. The clinical and epidemiological data collected were described and a comparison was made between these two centers studied.

RESULTS

the sociodemographic characteristics found were similar to those described in the medical literature. Data related to treatment and follow-up, such as the use of chemotherapy, use of specific imaging tests, digital rectal examination, and outpatient follow-up, differed between the two centers studied. There was a 25% loss of follow-up.

CONCLUSION

the characteristic of being a non-cancer center can interfere with the full application of the current protocol for the treatment of sacrococcygeal teratoma. The knowledge of the data of the studied cases can allow the optimization of the approach of the patients with this pathology and generate discussions about the integral application of the specific therapeutic protocol in the medical centers that are qualified for such treatment.

Prenatal ultrasonic features of a mediastinal teratoma: A case report and literature review

Fetal mediastinal teratomas represent only 10% of congenital teratomas in children and 2.6% of all mediastinal masses in children. Teratomas have multifactorial etiology, such as chromosomal abnormalities. Fetal mediastinal teratomas are rare. Mediastinal teratomas can cause hydrops fetalis, fetal demise, and neonatal respiratory distress; therefore, accurate perinatal management and interventions are very important. We describe a case of fetal mediastinal teratoma wherein the cystic fluid in the fetal tumor was aspirated and confirmed by surgical pathology after birth at the authors' center. The teratoma in this case was characterized by a large single cystic mass with clear borders in the anterosuperior mediastinum, which grew rapidly and was closely related to the thymus. The infant was healthy at birth, and the tumor was surgically removed the age of 1 year. The postoperative course was uneventful, and the patient was in good health 6 years postoperatively. This case and literature review suggests that ultrasound examination can accurately diagnose fetal mediastinal teratomas, which is beneficial to provide an accurate basis for fetal prenatal intervention and treatment. Additionally, an important ultrasound feature of a fetal unicystic mediastinal teratoma is a saddle-shaped mass with clear boundaries, which provided an accurate reference for the diagnosis of a fetal cystic mediastinal teratoma by prenatal ultrasonography.

Teratoma sacrococcígeo: avaliação de abordagem, tratamento e seguimento em dois centros de referência do estado do Rio de Janeiro

RESUMO Introdução: teratoma sacrococcígeo é o tumor neonatal mais comum. Alfafetoproteína é um marcador tumoral importante e é utilizado no período de seguimento como um marcador de malignidade. A ressecção cirúrgica completa do tumor associado a coccigectomia é o tratamento padrão, associado a quimioterapia em determinados estadiamentos. Exames de seguimento consistem em avaliação de marcadores tumorais, investigação de sítios de metástases, além de um completo exame físico. Metodologia: foi realizado um estudo retrospectivo descritivo, através da análise de 25 pacientes em dois centros de referência em tratamento oncológico infantil, com teratoma sacrococcígeo no Estado do Rio de Janeiro, entre 2004 e 2019. Os dados clínicos e epidemiológicos foram descritos, comparando-se os dois centros. Resultados: as características socio-demográficas foram similares ao descrito na literatura médica. Os dados relativos ao tratamento e seguimento, como o uso de quimioterapia, uso de testes de imagem específicos, exame de toque e retal e seguimento ambulatorial, foi diferente entre os dois centros. Tivemos uma perda de seguimento de 25%. Conclusão: a característica de ser um centro não oncológico pode interferir com a aplicação do protocolo de tratamento de teratoma sacrococcígeo. O conhecimento dos dados estudados pode permitir a otimização da abordagem dos pacientes com esta patologia e gerar discussões sobre a aplicação integral dos protocolos terapêuticos em centros médicos que são qualificados para tal tratamento.

Description of a giant hypothalamic hamartoma associated with an immature ruptured giant sacrococcygeal teratoma: a case report

Giant hypothalamic hamartomas (GHH) are rare neonatal intracerebral congenital malformations responsible for gelastic epilepsy and/or endocrine disturbances. Sacrococcygeal teratomas (SCT) are fetal neoplasms associated with perinatal morbidity and mortality, especially hemorrhagic complications in giant examples (GSCT). Here, we describe an immature ruptured GSCT complicated by hemorrhagic shock at 32-week gestation boy requiring an emergency delivery, followed immediately by urgent surgical removal. A brain lesion resembling a GHH was also present on the antenatal MRI. In order to exclude metastatic immature teratoma or glioma, a biopsy was performed by a retro-sigmoidal approach, which confirmed the nature of the hamartoma. Here, we describe for the first time the association of a ruptured immature GSCT associated with a GHH.

Imaging of the fetal oral cavity, airway and neck

Magnetic resonance imaging has proved to be an extraordinarily useful adjunct modality in assessment of the fetal face, oral cavity, head and neck because of its soft-tissue contrast, utility for acquiring more precise planar imaging and the inherent advantage of contrast provided by fluid-filled structures, including the oropharyngeal cavity, nasal passages and vascular structures. In this review, the author presents an organized approach to assessing normal anatomical structures of the fetus. The author presents cystic and solid lesions as well as structural and developmental abnormalities and discusses potential concomitant abnormalities. Prenatal consultation, patient counseling and delivery considerations are included.

EXIT-to-airway: Fundamentals, prenatal work-up, and technical aspects

Ex-utero intrapartum treatment (EXIT) is a delivery strategy developed to manage a variety of prenatally diagnosed conditions in the transition to newborn life. This procedure allows control and provides time for intervention in otherwise life-threatening malformations, such as congenital upper airway obstructions. EXIT-to-airway has changed the outcome of fetuses with these anomalies. The main purpose of this intervention is to improve the safety of establishing a reliable airway at birth. Maximal but controlled uterine relaxation to maintain feto-maternal perfusion and thus gas exchange, while keeping the fetal and maternal well-being are the paradigms of any type of EXIT. The most important aspect of fetal airway management is to consolidate a highly trained, well-coordinated, multidisciplinary team that is prepared for every contingency. A comprehensive prenatal assessment, including ultrasound, fetal echocardiogram, fetal MRI, and genetic testing is imperative for patient selection. Extensive preoperative planning, ad-hoc team meetings, and surgical simulations for challenging cases are critical strategies to achieve the best outcomes. This article outlines the prenatal work-up, decision making, technical aspects, and principles for a successful EXIT-to-airway procedure.

Fetal abdominal tumors and cysts

This article reviews the contemporary diagnosis and management of the most common abdominal neoplasms and cystic lesions diagnosed in the fetus. Fetal tumors discussed include teratomas (sacrococcygeal, cervical or mediastinal), mesoblastic nephroma, nephroblastoma (Wilms' tumor), neuroblastoma, and hepatoblastoma. Fetal abdominal cystic lesions discussed include ovarian cyst, choledochal cyst, intestinal duplication cyst, mesenteric cyst, simple hepatic cyst, and meconium pseudocyst. We discuss the rare indications for fetal intervention or fetal surgery and other perinatal management, including prenatal interventions and fetal surgery for sacrococcygeal teratoma. The lesions reviewed are detected by widespread use of screening ultrasonography during pregnancy. Work-up for these abnormalities may include fetal MRI which enhances the diagnostic accuracy of abdominal tumors and cystic lesions and can aid in characterization of the lesion in relationship to surrounding anatomic structures. Accurate prenatal diagnosis of such lesions permits recommendations for optimal location and timing of delivery, and inclusion of appropriate caregivers and expertise to facilitate postnatal management. Perinatal management of the fetus with a neoplasm requires consideration of the optimal timing and mode of delivery, and pediatric oncology and surgical specialty care. The majority of tumors diagnosed antenatally have good prognosis with current multimodality treatment.

Large Neck Teratoma in a Newborn with Respiratory Distress Syndrome

Neonatal tumours in the neck region are a rare finding. Teratomas typically comprise all three germ cell layers with tissues usually foreign to the anatomic site of origin. Head and neck teratomas account a smaller part of congenital teratomas. They can cause major airway obstruction due to the external compression that oropharyngeal or neck masses produce. In addition, there can be an intrinsic lesion in the larynx or trachea. We describe a premature, 30-gestational week-old newborn with large subcutaneous neck mass. Pre-delivery ultrasound showed heterogeneous tumor structure and displaced larynx. The intubation was successful. The newborn developed respiratory distress syndrome immediately after birth which rendered the surgical removal of the neck tumor impossible. An autopsy was done, and the histopathology revealed mature teratoma comprising muscle, brain, salivary and pulmonary tissues, as well as well-developed hyaline membranes in the alveoli. The combination of the respiratory distress syndrome and the neck tumor compression proved fatal. Prenatal diagnosis, therapeutic options and ex utero intrapartum treatment (EXIT) procedures are discussed for the diagnosis and management of this very rare tumor.

Fetal teratomas - A retrospective observational single-center study

OBJECTIVE

Evaluation of course and outcome of pregnancies with prenatally diagnosed fetal teratomas of various locations in a single center between 2002 and 2019.

METHODS

Retrospective observational single-center study including prenatally suspected or diagnosed fetal teratomas. Focus was put on ultrasound findings during pregnancy. Complications, need for intervention and outcomes were compared according to tumor location.

RESULTS

79 cases of fetal teratomas were seen at our center between 2002 and 2019. Most frequent tumor locations were the sacrococcygeal region (59.5%), neck (20.2%) and oropharynx (7.6%). Complications mainly included polyhydramnios and cardiac compromise. Need for intervention during pregnancy was significantly higher in pericardial teratomas. Preterm birth before 37 and early preterm birth before 32 weeks occurred in 72.7% and 29.1%, respectively. Major causes of perinatal death were tumor bleeding in sacrococcygeal teratomas (SCTs) and respiratory failure in cervical and oropharyngeal teratomas.

CONCLUSION

There is a high need for intervention in pregnancies complicated by fetal teratomas. Pericardiocentesis in pericardial teratomas is often inevitable to reduce the risk of intrauterine demise. Amniotic fluid drainage in associated severe polyhydramnios helps to reduce the risk of preterm birth, a major cause of additional morbidity and mortality. MRI in supplement to prenatal ultrasound is useful in fetal teratomas of the neck and oropharynx in order to plan delivery.

Fetal head and neck tumors

Imaging plays a leading role in detection and diagnosis of fetal head and neck lesions. These lesions comprise a heterogeneous group of congenital tumors and malformations. Complementary imaging modalities that can be used in prenatal medicine are ultrasound and MRI. The authors discuss imaging characteristics of fetal lesions, assessment of potential complications and pregnancy management options for the most common pathology of the fetal head and neck.

Imaging of fetal brain tumors

Congenital brain tumors, defined as those diagnosed prenatally or within the first 2 months of age, represent less than 2% of pediatric brain tumors. Their location, prevalence and pathophysiology differ from those of tumors that develop later in life. Imaging plays a crucial role in diagnosis, tumor characterization and treatment planning. The most common lesions diagnosed in utero are teratomas, followed by gliomas, choroid plexus papillomas and craniopharyngiomas. In this review, we summarize the pathogenesis, diagnosis, management and prognosis of the most frequent fetal brain tumors.

Prenatal sonographic features of fetal mediastinal teratoma

Mediastinal teratoma can cause severe hydrops fetalis, which worsens the effects of the mass compression on the vital mediastinal organs. A careful sonographic examination is mandatory to demonstrate the characteristic features suggestive of this congenital tumor. We describe these features at 20 weeks gestation. The most prominent finding was the heterogeneous echogenicity of a large cystic-solid mass with hyperechoic dots, seen as a part of the anterior mediastinum immediately posterior to the sternum. Additional diagnostic features included posterior displacement of the heart, low cardiac output, and hypoplasia of the normally structured heart and lungs due to the direct mass compression. These sonographic findings were confirmed at autopsy which confirmed a nonmetastatic immature teratoma. Sonography may enable accurate diagnosis of mediastinal teratoma considering the anterior location and heterogeneous appearance of the mass, posterior displacement of the heart, normal lung morphology, and compression effects on these organs.

Prenatal ultrasound and magnetic resonance evaluation and fetal outcome in high-risk fetal tumors: A retrospective single-center cohort study over 20 years

Introduction

Fetal tumors are rare and usually followed by poor outcome. We describe our single‐center experience with fetal tumors evaluated by ultrasound and magnetic resonance imaging (MRI). Our aims were to evaluate mortality and morbidity including long‐term outcome and to determine which ultrasound and MRI characteristics were helpful for pre‐ and perinatal management.

Material and methods

We conducted a retrospective analysis on prenatally diagnosed tumors between 1998 and 2018. Poor outcome included fetal or neonatal death and survival with serious illness. MRI addressed tumor morphology (sacrococcygeal teratomas), compromise of surrounding structures (head and neck tumors) and early depiction of brain alterations specific to tuberous sclerosis (rhabdomyomas).

Results

Of 68 pregnancies, 15 (22%) were terminated and eight children (8/53, 15%) died pre‐ or postnatally. Of the 45 survivors (45/68, 66%), 24 (24/45, 53%) were healthy, eight (8/45, 18%) had a minor illness and 13 (13/45, 29%) a serious illness. Diffusion‐ and T1‐weighted MRI reliably predicted tumor morphology in teratomas. To detect head and neck tumors critical to airway obstruction, MRI was superior to ultrasound in delivery planning. Rhabdomyomas were frequently associated with tuberous sclerosis, regardless of their number or size in ultrasound; MRI could depict specific brain alterations from the early third trimester onwards. For several rare tumors, MRI provided critical differential diagnoses that could not be clearly displayed in ultrasound.

Conclusions

The rate of survivors with serious long‐term illness among fetuses with prenatal diagnosis of a tumor was high. MRI is specifically helpful for risk stratification in fetal teratomas and delivery planning in head and neck tumors.

Fetal brain, head, and neck tumors: Prenatal imaging and management

Fetal tumors represent an infrequent pathology when compared to congenital malformations, although their true incidence may be underestimated. A variety of benign and malignant neoplasms may occur anywhere in the neural axis. Imaging plays an important role in the fetal tumor diagnosis and evaluation of their resultant complications. Discovery of a fetal mass on obstetric ultrasound necessitates further evaluation with prenatal magnetic resonance imaging (MRI). New MR sequences and new applications of existing techniques have been successfully implemented in prenatal imaging. A detailed assessment may be performed using a variety of MR. Fetal tumors may be histologically benign or malignant, but their prognosis generally remains poor, especially for intracranial lesions. Unfavorable tumor location or heightened metabolic demands on a developing fetus may result in severe complications and a fatal outcome, even in cases of benign lesions. Nowadays, prenatal treatment focuses mainly on alleviation of secondary complications caused by the tumors. In this article we review congenital tumors of the brain, face, and neck encountered in prenatal life, and discuss diagnostic clues for appropriate diagnosis.

Hydrops fetalis and neonatal abdominal compartment syndrome continuum from immature gastric teratoma: a case report

Background

Hydrops fetalis as well as abdominal compartment syndrome (ACS) are conditions that are associated with high mortality rates. A rare case of immature gastric teratoma causing fetal hydrops and subsequent ACS is presented. The related pathophysiologic mechanisms are discussed, and the importance of timely recognition and appropriate interventions are highlighted.

Case presentation

The male patient was born preterm, weighing 3.9 kg., by Cesarean section. Prior prenatal ultrasounds were normal, but a scan done just before delivery had findings indicating polyhydramnios, fetal ascites, and meconium peritonitis. Upon delivery, the patient had respiratory distress, anasarca and a massively distended abdomen. Resuscitation measures, including ventilatory support, were instituted. Imaging studies showed ascites as well as a large, complex intra-abdominal lesion with calcifications. In the succeeding hours, anuria persisted, anasarca worsened, the abdomen became more distended, and inotrope requirements increased. The occurrence of ACS, from what was presumed to be a retroperitoneal teratoma, was therefore considered. Laparotomy was done on the 28th hour of life, with en bloc excision of a massive tumor and attached section of the greater curvature of the stomach. Passage of urine occurred intra-operatively, and the patient was soon after weaned off inotropes and ventilator support. The histopathologic result was immature gastric teratoma. No chemotherapy was given, and the patient’s serum AFP is at normal levels 15 months following surgery.

Conclusion

The presence of a massive intra-abdominal lesion can result in the pathophysiologic continuum of hydrops fetalis and neonatal ACS. The early recognition of such an association can enable appropriate expectant management of similarly affected neonates, including emergent decompression laparotomy.

Superior Vena Cava Syndrome and Hypoxic Ischemic Encephalopathy Secondary to a Massive, Right-Sided Immature Cervical Teratoma

Cervical teratomas are a rare form of fetal teratoma that can grow to massive size. Generally, these masses can be surgically excised after birth with excellent physical and functional prognosis because the benign variants respect anatomical borders. The primary complications of these masses are associated with compromise of the trachea and esophagus: upper airway obstruction and polyhydramnios. We report the first documented occurrence of superior vena cava syndrome and hypoxic ischemic encephalopathy associated with a massive, right-sided cervical teratoma. This case highlights that when cervical teratomas are right-sided and sufficiently large, they can extend inferiorly and compromise central venous return to the heart. This unique presentation would likely have required fetal surgical excision to avoid catastrophic cerebral injury.

Prenatal diagnosis and prognosis assessment of fetal intra-abdominal cystic lesions: a retrospective study in 264 cases

To assess the accuracy of prenatal diagnosis and the prognosis of fetal-abdominal masses, we reviewed all of the cases which had been diagnosed as having abdominal masses from January 2014 to December 2016. In total, 264 cases were identified as having abdominal masses. Among them, 141 cases (53%) had received specific prenatal diagnoses by prenatal ultrasound (US). MRI had assisted in the diagnosis and prognostic evaluation in 69 cases, increasing the diagnostic rate to 65%. The prenatal diagnoses of 111 cases (65%) were concordant with the postnatal diagnoses. Surgical intervention after birth was needed in 96 cases (39%). Most outcomes were good (89%). We suggest that prenatal US can detect and identify most fetal abdominal masses and that MRI helps to further describe the masses. With early intervention after birth, the prognosis was good in most cases. Impact Statement What is already known on this subject? Fetal-abdominal masses are commonly detected in antenatal examinations. A prenatal ultrasound is the main screening tool for detecting fetal intra-abdominal cystic lesions. What the results of this study add? We suggest that MRI is more helpful in some systems to reveal locations and structures. Even prenatal diagnosis cannot reach before birth, prognosis is quite good and expectant therapy is sufficient. What the implications are of these findings for clinical practice and/or future research? Our data strengthens the current knowledge of fetal abdominal masses to help relieve anxious parents by telling them that this congenital malformation has good outcomes. But multidiscipline consultation is necessary.

Fetal Surgery

Fetal surgery is an established but still rapidly evolving specialty, born from the rationale that destructive embryologic processes, recognized early in gestation, can be curtailed by prenatal correction. As more and more centers begin offering fetal interventions, quality of care must be verified through transparency about clinical capabilities and resources. Level designations should be assigned based on capability, as in trauma and neonatal ICU centers for excellence, and volume requirements must be set for fetal surgery certification. Regionalization of this specialty care may be required to optimize outcomes.

Pediatric mediastinal germ cell tumors

Mediastinal germ cell tumors (GCTs) are a rare and heterogeneous group of neoplasms. Although histologically resembling their gonadal counterparts, they differ considerably in their clinical characteristics, biological behavior and prognostic outcome. The rarity of mediastinal GCTs has hindered their meaningful analysis, with most studies and clinical trials including them along with other extragonadal GCTs, which has led to a lack of consensus on optimal treatment strategies, and a lull in improvement in patient outcomes. Diagnosis of mediastinal GCT requires a multipronged approach, and encompasses multidisciplinary treatment including chemotherapy followed by surgery, with or without radiotherapy. In view of sustained response rates to current management protocols, the focus needs to be shifted to identifying patients in whom treatment regimens can be downscaled with the aim of decreasing long term morbidity and improving quality of life in low risk patient groups, while improving survival rates in poor risk patient subsets. In this scenario, better understanding of the molecular pathogenesis of these tumors may lead to identification of novel biomarkers and therapeutic targets, as well as improved disease segmentation and risk stratification, thus helping to avoid the toxicity and morbidity associated with current one-fits-all treatment strategies. Multi-institutional collaborations across continents are necessary to generate meaningful data, and are the face of future developments in this arena.

Prenatal diagnosis of cervical masses by magnetic resonance imaging and 3D virtual models: perinatal and long-term follow-up outcomes

Objective: To assess perinatal and long-term follow-up outcomes of fetal cervical masses diagnosed by three-dimensional (3D) magnetic resonance imaging (MRI) and 3D virtual models.Methods: This retrospective cohort study evaluated 15 pregnant women (age, 21-38 years) at 29-40 weeks of singleton gestation, whose fetuses exhibited congenital oral and cervical masses. These women were referred to our facility because of suspected fetal malformations on routine obstetric ultrasound, and the cases were confirmed, excluded, or complemented by MRI. Demographic data and perinatal and long-term follow-up outcomes were assessed.Results: Cervical masses were predominant in females (3:2), and the most frequent diagnosis was lymphatic-venous malformation (71%). The masses were cystic in 53.3% of the cases and solid in 46.7%. The esophagus and trachea were displaced in 46.6% of the cases. Associated malformations were diagnosed in 13.3% of the cases. There was complete agreement between prenatal MRI and postnatal diagnoses. Among the newborns, 40% had complications and 46.6% were admitted to the neonatal intensive care unit. Two infants died from complications due to epignathus. Surgical resection was performed in 33.3% of the cases, including complete resection in 26.6%. Sclerotherapy was administered to 53.3% of the cases, with complete remission achieved in 50% of these cases.Conclusion: Cervical masses diagnosed in the prenatal period had good postnatal outcomes except for cases of epignathus, which were associated with high mortality. MRI demonstrated the relationship between cervical masses and adjacent organs and allowed 3D virtual reconstruction of the airways. There was complete agreement between the prenatal diagnosis of cervical masses on MRI and postnatal diagnosis. Surgical treatment was effective in most cases, and sclerotherapy was satisfactory in cases with intrathoracic components.

Fetal interventional procedures and surgeries: a practical approach

The identification of congenital birth defects and fetal malformations continues to increase during the antenatal period with improved imaging techniques. Understanding of how to treat specific fetal conditions continues to improve outcomes from these treatment modalities. In an effort to further improvement in this field, we provide a review that begins with a brief background of fetal surgery including the history of fetal surgery, ethics surrounding fetal surgery, and considerations of how to treat the fetus during intervention. A synopsis of the most commonly encountered disease processes treated by fetal intervention/surgery including definitions, treatment modalities, and outcomes following fetal intervention/surgery is then provided. Within the sections describing each disease process, methodology is described that has helped with efficiency and success of procedures performed at our institution.

Massive fetal cervical teratoma managed with the ex utero intrapartum treatment (EXIT) procedure

Teratomas are rare congenital tumors typically comprising all 3 germ cell layers. Cervical teratomas arise in the neck and represent a minority of all teratomas. These are associated with high morbidity and mortality because of their propensity to cause airway obstruction. Demonstration on prenatal magnetic resonance imaging is uncommon, especially for a tumor of this size. Fetuses diagnosed with large neck masses are managed through cesarean section with the ex utero intrapartum treatment procedure to secure the airway, such as in our case of a large cervical teratoma in the female fetus of a 30-year-old mother who went into preterm labor.

Management of Giant Cervical Teratoma with Intracranial Extension Diagnosed in Utero

Cervical teratomas are rare germ cell tumors affecting the fetus that are associated with significant morbidity and mortality due to an increased risk of airway obstruction at delivery. These tumors can commonly produce polyhydramnios that results from the fetus' impaired ability to swallow amniotic fluid. Improved rates of prenatal diagnosis through comprehensive evaluations and imaging have dramatically impacted the perinatal management of infants with this condition. Here, we report a patient diagnosed with polyhydramnios whose fetus was discovered to have a giant cervical teratoma on imaging studies. The child underwent surgical resection after having the airway secured under the uteroplacental support as part of an ex utero intrapartum treatment procedure performed at 37 weeks. The following gross pathological and magnetic resonance images demonstrate this condition and its currently accepted treatment.