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Metaplastic change characterized by small tubules lined by a single layer of cuboidal, flat, or hobnail cells containing eosinophilic secretion with features similar to mesonephric tubules.
This is an uncommon lesion. Most patients have a previous bladder surgery or irritants such calculi or trauma, or kidney transplantation.
Usually seen in adults but rare in children
Male: female: 3:1
The bladder is the most common (55%) followed by urethra (41%) or ureter (4%).
These are less than 1 cm polypoid, flat, or papillary lesions. Large size examples have been reported.