An additional case of a benign polypoid tumor of the urinary bladder is reported, the first one observed at autopsy and the first in which photographic documentation of the gross appearance is presented. The lesion was first described as an adenomatoid polyp in 1927. We consider the subsequent (1963) designation of inverted papilloma misleading. Because its histologic morphology bears a striking resemblance to Brunn's nests and because the term papilloma of the urinary bladder connotes potential malignant change, we propose the designation brunnian adenoma. All cases previously reported have been benign.
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