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Clinical Problem Solving: Radiology
July 2011

Radiology Quiz Case 3: Diagnosis

Author Affiliations
 

SECTION EDITOR: C. DOUGLAS PHILLIPS, MD

Arch Otolaryngol Head Neck Surg. 2011;137(7):721-722. doi:10.1001/archoto.2011.97-b

Diagnosis: Cervicomediastinal thymic cyst

Cervicomediastinal thymic cysts are rare congenital neck masses. Embryologically, the thymus develops from the ventral aspect of the third branchial pouch during the sixth week of fetal life along with the inferior parathyroid gland. It further descends along the thymopharyngeal tract and occupies its place in the superior mediastinum by 12 weeks. At birth, it weighs approximately 13 g, reaching its absolute size at puberty. Later in adult life, it is replaced by fibrofatty tissue. It acts as a secretory organ in cell-mediated immunity. T lymphocytes derived from the bone marrow undergo differentiation in the thymus gland.

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