Embryogenesis of enterocystomas-enteric duplication cysts of the tongue.

Enteric duplication cysts of the tongue are unusual lesions that may be confused with dermoid cysts, hemangiomas, lingual thyroid remnants, ranulas, and cystic hygromas. Two cases of lingual enteric duplications are reported in a 5-year-old boy and a 4-month-old boy. In the first case the cyst was lined by gastric-type epithelium, and in the second by colonic-type epithelium. Theories of pathogenesis of enteric duplications include development from small epithelial inclusions trapped during fusion of primordial tissues, from incomplete coalescence of lacunas that form between epithelial cells of the solid core of the developing gut, from persistence of epithelial buds within the wall of the bowel, or from nests of trapped entodermal cells. However, each of these theories presents problems with respect to lingual enteric cysts, as possible trapping of epithelium by fusing primordia does not explain the presence of heterotopic mucosa, and the tongue does not develop in the same manner as the hollow viscera. It becomes apparent therefore that enteric duplication cysts are a heterogeneous group of lesions that share some morphologic features, but perhaps not the same pathogenesis.