title: Osteoclast-rich undifferentiated carcinoma of the urinary tract: cytologic findings and literature review.
abstract: The association of urothelial carcinoma with osteoclast-like giant cells is an exceptionally rare event. To our knowledge, there are no published reports of the cytopathologic characteristics of osteoclast-rich undifferentiated carcinoma of the urinary tract. We report herein, the case of a 63-year-old man who was evaluated at The Johns Hopkins Hospital for gross hematuria of 4 months duration. Urinary cytology displayed high-grade malignant cells with scattered osteoclast-like giant cells in a background of acute inflammation and abundant red blood cells. Subsequently, a transurethral tumor resection was performed, which revealed infiltrating undifferentiated carcinoma with osteoclast-like giant cells. The rarity of this neoplasm and its resemblance to other giant cell-rich processes may pose diagnostic difficulties. A review of the important differential diagnoses is also presented.
authors.affiliation: Department of Pathology, The Johns Hopkins Hospital, Baltimore, Maryland 21287, USA.
authors.forename: Shobha
authors.initials: S
authors.lastname: Castelino-Prabhu
authors.forename: Syed Z
authors.initials: SZ
authors.lastname: Ali
mesh_terms: D002277:Carcinoma / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010010:Osteoclasts / Q000473:pathology*; D014551:Urinary Tract / Q000473:pathology*; D014571:Urologic Neoplasms / Q000473:pathology*