Overview of cervical teratoma

Cervical teratomas are rare congenital tumours that arise from pluripotent germ cells, capable of differentiating into multiple embryonic tissue types. These tumours typically contain elements from all three germ layers, ectoderm, mesoderm, and endoderm. They are most commonly benign, meaning they are not cancerous and do not spread to other parts of the body, though their anatomic location can lead to significant morbidity.¹

Embryologically, cervical teratomas are thought to originate during early fetal development due to aberrant migration or misplacement of germ cells in the anterior neck region. They are usually located in the infrahyoid neck (part of the neck below the hyoid bone) and can grow to considerable sizes, often causing mechanical compression of adjacent structures.

The estimated incidence of cervical teratoma is approximately 1 in 20000 to 40000 live births, with no significant gender predilection. Although histologically benign in most neonatal cases, their size and location make them clinically significant, particularly due to the risk of airway obstruction at birth. In utero, these masses can cause polyhydramnios, tracheoesophageal compression, or hydrops fetalis due to impaired venous return.²

Prompt prenatal identification is essential for perinatal planning, including potential need for specialized delivery techniques such as the EXIT (Ex Utero Intrapartum Treatment) procedure to secure the airway before complete delivery.³

Prenatal detection and diagnosis

The prenatal identification of cervical teratomas is most often achieved through routine obstetric ultrasound. Typically detected during the second trimester, these tumours appear as heterogeneous masses in the anterior or lateral neck, often with cystic and solid components.⁴ Polyhydramnios may be a secondary finding due to impaired fetal swallowing. Colour Doppler can help assess vascularity and distinguish the mass from vascular malformations.

When a fetal neck mass is detected, targeted high-resolution ultrasound is essential to determine the lesion’s size, extent, composition, and its relationship to vital structures such as the trachea and oesophagus. However, limitations in soft tissue contrast and visualization of deeper structures often necessitate additional imaging.

Fetal magnetic resonance imaging (MRI) serves as a critical adjunct in the evaluation of large cervical masses. MRI offers superior delineation of tissue planes and is particularly valuable for assessing potential airway compromise by visualizing tracheal compression or deviation.² This imaging modality aids in planning perinatal interventions such as the EXIT (Ex Utero Intrapartum Treatment) procedure, where airway management must be anticipated before delivery is complete.³

The differential diagnosis for fetal neck masses includes cystic hygroma (lymphatic malformation), congenital goiter, hemangioma, neuroblastoma, and branchial cleft anomalies.¹ Accurate differentiation requires careful imaging review combined with clinical and biochemical data when available.

In parallel, a comprehensive assessment of fetal well-being is necessary. Serial ultrasounds monitor growth parameters, amniotic fluid levels, and potential development of non-immune hydrops, which may indicate high-output cardiac failure or impaired venous return due to mass effect.⁴ Risk stratification determines the need for early delivery, in utero interventions, or transfer to a tertiary care centre for specialized delivery planning.

Principles of prenatal counselling

Cervical teratomas are rare congenital tumours arising from germ cells capable of forming tissues from all three embryonic layers. Though typically benign, their anterior neck location poses a significant risk of airway obstruction. Prenatal detection is most often via second-trimester ultrasound and fetal MRI is critical for planning, as these tumours may cause polyhydramnios, tracheal compression, or hydrops fetalis.

Effective prenatal counselling is essential, emphasizing potential complications and the possible need for specialized delivery techniques like the EXIT procedure.³ A coordinated multidisciplinary team, including maternal-fetal medicine, neonatology, paediatric surgery, ENT, anaesthesiology, and radiology, guides diagnosis, delivery, and postnatal care.¹

Delivery is typically via caesarean, with EXIT employed in high-risk cases to secure the airway while maintaining uteroplacental circulation.³ After birth, stabilization and imaging guide timely surgical excision, aiming for complete resection while preserving vital structures.¹

Long-term follow-up includes surveillance for recurrence with imaging and AFP levels, along with developmental assessments and feeding support.^1,5 Prognosis is generally favourable with early intervention and comprehensive care. An integrated approach from diagnosis through postnatal care is essential to mitigate morbidity and optimize outcomes for affected neonates and their families.

Multidisciplinary team planning

Optimal management of cervical teratoma begins with the formation of a coordinated multidisciplinary team that integrates expertise across maternal, fetal, and neonatal care. The complexity of these cases, particularly the risk of airway obstruction at birth, demands early and ongoing collaboration among key specialists.^3,4

The core team typically includes a maternal-fetal medicine (MFM) specialist, who leads prenatal surveillance and risk assessment. A neonatologist prepares for immediate postnatal stabilization, while a paediatric surgeon and paediatric otolaryngologist (ENT) evaluate surgical and airway intervention strategies. Anaesthesiologists, particularly those experienced in fetal and neonatal care, are essential for planning delivery procedures like the EXIT (Ex Utero Intrapartum Treatment). Radiologists contribute to diagnostic clarity through the interpretation of high-resolution ultrasound and fetal MRI, which help define the lesion's extent and its relationship to vital structures.^2,3

The development of an individualized care plan is essential and must take into account the tumour size, location, gestational age at diagnosis, and signs of fetal compromise. This plan outlines delivery timing, location (preferably at a tertiary care centre), and potential interventions required at birth.²

Effective coordination across the prenatal, intrapartum, and postnatal continuum ensures seamless transitions and reduces perinatal risks. Regular multidisciplinary case conferences allow all team members to remain aligned and update the care plan based on fetal condition, imaging findings, and family preferences.

This team-based approach not only improves clinical outcomes but also enhances communication with families, ensuring they are informed, supported, and engaged throughout the process.

Delivery and airway management strategies

Delivery planning for fetuses diagnosed with cervical teratoma requires careful timing, selection of delivery method, and preparation for airway management.¹ The primary concern is airway obstruction at birth due to tumour mass effect, which can lead to immediate respiratory compromise or death if not managed proactively.

The timing of delivery is often guided by tumour growth rate, signs of fetal compromise (such as hydrops fetalis or polyhydramnios), and overall fetal lung maturity. In the absence of complications, delivery is ideally planned at or near term in a controlled, tertiary care setting. Caesarean section is the preferred mode of delivery for large cervical masses to prevent dystocia or trauma and to facilitate surgical airway access if needed.

For cases with suspected or confirmed airway obstruction, the EXIT procedure offers a life-saving strategy. During EXIT, the fetus is partially delivered via caesarean section while remaining on uteroplacental circulation.³ This allows time for the surgical team to secure the airway through intubation, tracheostomy, or mass debulking before full delivery and umbilical cord clamping.

Successful execution of EXIT requires detailed planning and real-time coordination among maternal-fetal medicine, anaesthesia, neonatology, ENT, and paediatric surgery teams. Uterine relaxation is maintained during the procedure to preserve placental perfusion, and fetal monitoring is critical throughout.^3,4

Following delivery, neonatal stabilization includes securing the airway, assessing respiratory effort, and initiating resuscitation if needed. Immediate postnatal evaluation involves imaging to confirm tumour extent, airway patency, and ruling out other congenital anomalies. Definitive surgical resection is typically performed after stabilization, depending on the neonate’s clinical status.^1,2

Postnatal care and long-term outcomes

Following successful delivery and airway stabilization, infants diagnosed with cervical teratoma require timely surgical intervention and comprehensive postnatal monitoring. Definitive surgical management typically involves complete excision of the tumour within the first days to weeks of life, contingent upon the neonate’s stability. The surgical goal is total resection while preserving critical neurovascular structures.¹ Histopathologic evaluation confirms the diagnosis and classifies the tumour as mature, immature, or, in rare instances, malignant. Most neonatal cervical teratomas are benign, though the presence of immature elements may signal a higher risk of recurrence and necessitate ongoing surveillance.^1,2

Short-term neonatal monitoring focuses on:

• Respiratory function: Infants may require prolonged intubation or tracheostomy, especially if airway structures were involved or compromised during resection
• Feeding and swallowing: Dysphagia and aspiration risks are common due to mass effects on pharyngeal/oesophageal structures, potentially requiring nasogastric or gastrostomy tube feeding
• Neurological assessment: Essential for identifying potential deficits related to in utero compression or surgical proximity to cervical spinal elements

Long-term follow-up is critical and includes:

• Recurrence monitoring: Though rare in completely excised mature teratomas, recurrence can occur, particularly in tumours with immature histology. Surveillance involves serial imaging and serum tumour markers such as alpha-fetoprotein (AFP)
• Developmental surveillance: Regular assessments for motor, speech, and cognitive delays, in line with American Academy of Paediatrics (AAP) guidelines, ensure timely therapeutic interventions if needed⁵

Prognosis is generally favourable when airway compromise is promptly addressed and complete resection is achieved.^1,2 Key prognostic indicators include:

• Tumour size and anatomical complexity
• Degree of airway obstruction at birth
• Presence of fetal hydrops
• Histologic features of the teratoma

Most children experience good long-term quality of life, though some may benefit from supportive therapies, such as speech-language intervention or feeding therapy.

Summary

Cervical teratomas, though rare and often histologically benign, pose significant risks due to potential airway compromise. Early prenatal detection, comprehensive family counselling, and coordinated multidisciplinary care are essential for optimal outcomes. The EXIT procedure remains a pivotal tool for managing perinatal airway obstruction. With complete surgical resection and long-term developmental support, the prognosis is favourable for most affected infants.^3,4

Frequently asked questions (FAQs)

What is a cervical teratoma and how common is it?

A cervical teratoma is a rare congenital tumour in the neck, formed from germ cells that can develop into different tissue types. It occurs in approximately 1 in 20000 to 40000 live births and is usually benign, though it can cause serious complications due to its location.

How is a cervical teratoma diagnosed before birth?

Cervical teratomas are typically detected via second-trimester ultrasound as mixed cystic-solid neck masses. Fetal MRI is often used for better detail and to assess airway compression, which is crucial for planning delivery.

What is the EXIT procedure and when is it used?

The EXIT (Ex Utero Intrapartum Treatment) procedure is a specialized delivery technique used when airway obstruction is anticipated. It allows the baby to remain on placental support while the airway is secured before full delivery.

What is the long-term outlook for babies with cervical teratoma?

With early diagnosis, coordinated care, and complete surgical removal, the prognosis is generally excellent. Long-term follow-up focuses on developmental progress, recurrence monitoring, and support for feeding or speech issues if needed.