Abstract.The number of studies reporting lymphoma as a secondary tumor has gradually increased. However, few studies have reported that occurrence of lymphoma as a secondary tumor following treatment for penile carcinoma, particularly cases in which the lymphoma was diagnosed by fine-needle aspiration cytology and flow cytometry. The present study reports the case of a 62-year-old male patient who was troubled with frequent urination and repeated chest tightness for 5 years. The diagnosis upon admission was penile carcinoma. Two months subsequent to the tumor removal surgery, enlarged lymph nodes were extracted from the patient using fine-needle biopsy, to be analyzed using light microscopy and flow cytometry. Smear results indicated a large number of abnormal cells scattered in the right axillary lymph node. Flow cytometry immunophenotyping of fine-needle aspiration samples indicated the increased expression of cluster of differentiation (CD)79a, CD19, CD20, CD38, κ chain and human leukocyte antigen-DR, which supported a diagnosis of B-cell lymphoma. Thus, the patient was diagnosed with B-cell lymphoma based on the results of the fine-needle aspiration biopsy and flow cytometry. The method of diagnosis and causes of therapy-related leukemia are discussed in the present report.
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