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Atypia in surface cells of urothelial papilloma or inverted papilloma. a Polypoid mass with an inverted pattern of urothelial nests. b Atypia (asterisk) is noted in the surface (circle) of the inverted nest. c Atypical cells are not immunoreactive to MIB. d Syncytial changes of atypical cells (asterisk) are restricted to the surface (circle). e MIB is scattered, but not expressed in the atypical cells (asterisk) of the surface (circle)
