Congenital heterotopic gastrointestinal cyst of the neck

Magnetic resonance imaging. (A) Axial (STIR sequence) showing a high signal mass in the right submandibular triangle extending medially into the sublingual space and (B) coronal (T1 weighted, fat suppression and gadolinium contrast) showing the multiloculated cystic mass with enhancing wall.

Multiloculated appearance of cyst lined by gastrointestinal epithelium (hematoxylin–eosin stain [HES] 20×).

Histological section of cyst showing (A) gastric body/fundus type mucosa (HES 100×), (B) small intestine type mucosa with villi and Paneth cells (HES 100×), and (C) large bowel type mucosa (HES 200×).

Metaplastic respiratory type epithelium within the cyst (HES 200×).