Adenomyoma of the small intestine in an adult: a rare cause of intussusception.

Adenomyoma of the small intestine is an extremely rare entity characterized by a mixture of glandular structures lined by columnar epithelium, with intervening bundles of smooth muscle. We report a case of adenomyoma of the jejunum that caused intussusception in an adult. Histologically, the morphologic features are typical of adenomyoma and are noteworthy for the extensive cystic change.