Open AccessPrimary uterine diffuse large B-cell lymphoma involving the urinary bladder with urinary cytology mimicking carcinomas: A case report
Author(s) -
Sumiyo ADACHI,
Kazuto Yamazaki,
Shanshan Liang,
Yasuo Ishida
Publication year - 2015
Publication title -
journal of cytology/journal of cytology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 19
eISSN - 0974-5165
pISSN - 0970-9371
DOI - 10.4103/0970-9371.168845
Subject(s) - pathology , urinary bladder , lymphoma , cytokeratin , immunophenotyping , medicine , cytology , urinary system , transitional cell carcinoma , small cell carcinoma , carcinoma , bladder cancer , cancer , immunohistochemistry , urology , antigen , immunology
We report a rare case of a 69-year-old woman in whom diffuse large B-cell lymphoma (DLBCL) originated from the uterus and involved the urinary bladder. The cervical smears of the case mostly consisted of discohesive atypical round cells, which were highly suggestive of lymphoma; however, in voided urine smears, a majority of the cells formed large aggregates of degenerated cells, mimicking those of urothelial carcinoma (UC). The smears also represented some small loose clusters, in which tumor cells formed short chains with nuclear molding, mimicking those of small cell carcinoma. The cytodiagnosis got definitive when we identified the atypical cells that showed CD20+/CD3-/cytokeratin-/NSE- immunophenotype. These are of particular concern as they may have misleading similarities to other epithelial neoplasms when examining lymphoma involving the urinary bladder. Accordingly, this case highlights the importance of immunocytochemistry to rule out malignant lymphoma when encountering large and/or small loose clusters of atypical round cells on urinary cytology.