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Cytologic diagnosis of mesonephric adenocarcinoma of the urinary bladder.

Mesonephric adenocarcinoma is a rare primary neoplasm of the urinary bladder, composed of papillary and glandular structures with clear-cell features. A case is reported in which cytologic examination of urine specimens showed the distinctive dimorphic cell population of small cells in papillary formations and larger cells with features of a clear-cell adenocarcinoma, permitting a specific diagnosis.