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Metastatic tumors are malignant neoplasms that involve urologic organs secondarily.
The incidence varies in different organs. Bladder is the most frequent site of secondary involvement along the urinary tract and male genital organs. Metastatic tumors to the bladder are mainly gastric carcinoma, skin tumors, lung and breast carcinoma. Colonic, prostatic, rectal, and cervical carcinomas involve the bladder with direct spread. The secondary involvement of the other genitourinary organs (testis, penis, kidney, and prostate) represents a small numerical entity but a source of stimulating diagnosis for the pathologist. Kidney and testis are mainly involved via hematogenous spread; the most common primary tumors for renal metastases are lung or controlateral kidney carcinomas; while prostatic carcinoma or gastrointestinal tract tumors can metastasize to the testis. Uncommon secondary tumors involving prostate and penis (Giunchi...