Plasmacytoid variant of urothelial carcinoma: a report of a rare case.

Plasmacytoid variant of urothelial bladder carcinoma is rare. We report a case with a detailed discussion of features that help characterize this variant. A 50-year-old man originally presented with gross hematuria. Resections at that time revealed a grade I-II superficial urothelial carcinoma. He did not return for follow-up until recently, three years later, when he presented with recurrent gross hematuria. An extensive tumor was identified on cystoscopy. Resection revealed a high-grade non-invasive papillary urothelial carcinoma. CT scan revealed a large urinary bladder solid mass with bilateral hydronephrosis. Metastatic workup was negative. The patient underwent a radical cystectomy with creation of ileal conduit. Final pathology revealed plasmacytoid variant of urothelial carcinoma with extensive vascular invasion and extension to the perivesical adipose tissue. We present a rare variant of urothelial carcinoma with comprehensive analysis of the morphological and immunophenotypic clues that characterize this variant.