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Pagetoid urothelial carcinoma in situ (CIS) is a rare variant of bladder cancer that is characterized by an intraepithelial proliferation of large cells arranged singly or in clusters and randomly distributed. These neoplasms deserve recognition and attention, chiefly because they may be overlooked or misdiagnosed as urothelial dysplasia, then causing unsuspected tumor recurrence after surgery. We...
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