[Cervical thymic cyst in childhood]

Area of Science:

• Pediatric Surgery
• Head and Neck Pathology
• Developmental Biology

Background:

• Cervical thymus cysts are rare congenital anomalies presenting as neck masses in children.
• They are often mistaken for branchial cleft cysts due to similar clinical presentation.
• Limited literature exists, particularly in Spanish, documenting these rare cases.

Observation:

• A 6-year-old boy presented with a right-sided neck swelling noticed over several months.
• Initial imaging (ultrasound and MRI) suggested a cystic mass, consistent with a branchial cyst.
• Surgical excision of the mass was performed for diagnosis and treatment.

Findings:

• Histopathological examination revealed a cystic mass containing thymic tissue remnants within its walls.
• This confirmed the diagnosis of a cervical thymus cyst, differentiating it from a branchial cyst.
• The case adds to the small number of documented cervical thymus cysts in pediatric patients.

Implications:

• Accurate diagnosis of cervical thymus cysts is crucial for appropriate management in pediatric patients.
• This case underscores the need for thorough histopathological evaluation of neck masses, even when imaging suggests other common diagnoses.
• Increased awareness and reporting, especially in non-English literature, can improve understanding of this rare condition.