Aberrant colonic epithelium in the bladder: report of a case

We report autopsy findings of an immature neonate whose bladder included a focus of colonic type epithelium in the posterior wall. The small island of mucosa consisted of columnar epithelium with numerous goblet cells and crypt formation. There appeared to be several signet-ring cells in the transitional epithelium adjacent to this area. No gross congenital abnormalities of the bladder or inflammation of the lamina propria was observed. The island of colonic epithelium was considered to be aberrant enteric mucosal tissue rather than glandular metaplasia of the transitional cell epithelium.