Incidental chronic lymphocytic leukemia diagnosed following radical prostatectomy for prostate cancer: A case report

•Chronic lymphocytic leukemia (CLL) patients have a high risk of occurrence of secondary cancers. This risk is three times higher for all cancers and eight times higher for skin cancer.•The coexistence of CLL and adenocarcinoma of the prostate is rare.•Early detection of lymphoma after radical prostatectomy will allow optimal management.