CT evaluation of lymph node status at presentation of prostatic carcinoma.

Computed tomographic (CT) studies performed within a general oncology service in 104 consecutive patients with prostatic carcinoma were reviewed retrospectively to assess the incidence and distribution of lymphadenopathy. All patients were staged with CT at initial presentation, had normal skeletal scintigrams and were candidates for radical radiotherapy. The likelihood of lymphadenopathy was associated with increasing T-stage. 57 of the 92 (62%) patients without lymph node enlargement had local disease confined to the prostate (T2 or less) compared with only two of the 12 (17%) patients with enlarged nodes. Lymph node enlargement was more likely with a primary tumour of poorly differentiated histology. 12 patients (11.5%) had lymphadenopathy by established CT criteria; six with pelvic nodal enlargement alone and six with enlargement of pelvic and retroperitoneal nodes. In all patients pelvic nodal enlargement predominated and no patient had isolated retroperitoneal lymphadenopathy. Our findings indicate that CT staging studies of prostatic cancer do not need to include the retroperitoneum if there is no lymphadenopathy at or below the aortic bifurcation.