Fine needle aspiration study of metastatic mixed adenosquamous carcinoma of the renal pelvis. A case report.

The findings in a fine needle aspirate of a psoas area metastasis from a mixed adenosquamous carcinoma of the renal pelvis are presented. The primary renal tumor is apparently the fourth such case reported in the literature; the pathogenesis of such tumors is briefly reviewed. The value of fine needle aspiration in excluding a clinically suspected abscess and in allowing a specific diagnosis of malignancy is emphasized.