Penile metastasis from prostate cancer: Diagnosis with sonography

Tumors of the penis, whether primary or secondary, are rare. Squamous carcinoma is the most common primary tumor. Metastases to the penis generally occur with locally advanced genitourinary neoplasms, particularly prostate cancer. Although clinical findings of nodularity and swelling of the penis are quite suggestive, the extent of tumor involvement cannot be fully ascertained by physical examination. High-resolution sonography has been shown to be a valuable tool for imaging of pathologic penile conditions. We report a case of penile metastases from prostate carcinoma that was diagnosed with sonography and confirmed with sonographically guided fine needle aspiration biopsy.