title: A patient with primary plasma cell leukemia accompanied by an extensive polypoid infiltration of the gastrointestinal tract.
abstract: A 37-year-old male presented with primary plasma cell leukemia (PCL) with kappa-type Bence Jones proteinuria (BJP) and polyposis of the stomach and colon. His plasma cell leukemia was not preceded by a pre-existing multiple myeloma, and presented the complication of polyposis in both stomach and colon. Biopsy of mucosal lesions revealed marked accumulation of atypical plasma cells with positive cytoplasmic kappa-chain. No amyloidosis was present. His disease responded remarkably well to intermittent melphalan and prednisolone. This case represents an uncommon combination of primary plasma cell leukemia and polypoid gastrointestinal lesions with plasma cell infiltration.
authors.affiliation: Third Department of Internal Medicine, Gunma University School of Medicine, Maebashi, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Sakai
authors.forename: M
authors.initials: M
authors.lastname: Sawamura
authors.forename: J
authors.initials: J
authors.lastname: Tamura
authors.forename: S
authors.initials: S
authors.lastname: Okamura
authors.forename: M
authors.initials: M
authors.lastname: Karasawa
authors.forename: H
authors.initials: H
authors.lastname: Murakami
authors.forename: M
authors.initials: M
authors.lastname: Omine
authors.forename: Y
authors.initials: Y
authors.lastname: Nakazato
authors.forename: T
authors.initials: T
authors.lastname: Naruse
authors.forename: J
authors.initials: J
authors.lastname: Tsuchiya
mesh_terms: D000328:Adult; D003111:Colonic Polyps / Q000473:pathology*; D006801:Humans; D007952:Leukemia, Plasma Cell / Q000473:pathology*; D008297:Male; D009361:Neoplasm Invasiveness; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D010950:Plasma Cells / Q000473:pathology; D011127:Polyps / Q000473:pathology*; D013274:Stomach Neoplasms / Q000473:pathology*