Prostatic infiltration in leukaemia and lymphoma

12 cases are reported in which the prostate was the site of a leukaemic or lymphomatous infiltration. Hodgkin's disease, not previously reported as involving the prostate, was seen in one instance. In all cases the diagnosis was made histologically. Although 5 patients were known to have leukaemia or lymphoma prior to surgery, the preoperative clinical diagnosis in 3 cases was benign prostatic hypertrophy and in 3 instances prostatic carcinoma. In 6 patients, the initial diagnosis of leukaemia or lymphoma was made on the prostatic specimen and in one instance infiltration was discovered at postmortem. The management of leukaemic and lymphomatous infiltration is discussed.