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Challenges in diagnosing ectopic thymus tissue in children.

Laura Claes¹, Amélie Dendooven², Jaques van Heerden^1,3

¹Paediatrics, Antwerp University Hospital, University of Antwerp, Edegem, Belgium.

BMJ Case Reports

|September 20, 2019

Summary

A rare case of a fast-growing neck mass in a child was diagnosed as a hemorrhagic ectopic cervical thymic cyst. This finding highlights the importance of considering unusual diagnoses for pediatric neck masses.

Keywords:

congenital disorders immunology paediatric oncology paediatrics

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Published on: June 9, 2015

Area of Science:

Pediatric Surgery
Head and Neck Pathology
Developmental Biology

Background:

Fast-growing cervical masses in children require urgent evaluation due to potential mass effects and a broad differential diagnosis.
Ectopic cervical thymic cysts are rare congenital anomalies that can present as neck masses.

Observation:

A 4.5-year-old boy presented with a rapidly enlarging, unilateral neck mass with concerning malignant features.
Surgical excision and pathological examination were performed for diagnosis.

Findings:

The mass was pathocytologically identified as a hemorrhagic ectopic cervical thymic cyst.
Thymic cysts are uncommon causes of unilateral neck masses, typically slow-growing and asymptomatic.

Implications:

This case underscores the necessity of including rare entities like hemorrhagic thymic cysts in the differential diagnosis of pediatric cervical masses.
Surgical excision is the recommended treatment for symptomatic thymic cysts, with cautious consideration for preserving thymic tissue in pediatric patients.