High-grade urothelial carcinoma of the bladder with rhabdoid features: cytological and histological report of two cases

An Antenatally Detected Pure Malignant Rhabdoid Tumor of the Bladder

Pediatric malignant rhabdoid tumors are a rare entity with poor prognosis. The extrarenal variants of this disease are sparsely presented within the literature. Our case represents, to our knowledge, the first antenatally detected bladder-variant. At 19 months of age, this patient has benefited from early detection and intervention and remains disease free following partial cystectomy and chemotherapy.

Urothelial Carcinomas of the Urinary Bladder With Plasmacytoid or Rhabdoid Features and Tendency of Epithelial-Mesenchymal Transition in 3 Dogs

Plasmacytoid and rhabdoid variants of urothelial carcinomas (UCs) of the urinary bladder have been described in humans with plasma cell-like or rhabdoid cellular appearance and aggressive clinical outcome. Canine UC of the bladder is generally classified as papillary/nonpapillary and infiltrating/noninfiltrating with limited information regarding other histological patterns. We report 3 cases of UC of the urinary bladder showing a unique discohesive cellular morphology with malignant behavior resembling the human plasmacytoid and rhabdoid variants of UC, which may raise some difficulties in diagnosis. Epithelial-mesenchymal transition and reduced E-cadherin expression were revealed by immunohistochemistry in 2 cases, possibly explaining the discohesive and invasive behavior of the tumor cells. The findings broaden the morphological spectrum as well as the distinct clinical features of canine UC of the urinary bladder.