腎細胞癌の筋転移：非典型的な臨床像

Secondary muscular metastases of clear-cell renal carcinoma (CCRC) are very rare and exceptional. We report the case of a 67-year-old patient who presented clinically with back pain, a chronic cough, and a mass on the left arm. A thoraco-abdomino-pelvic CT scan showed the presence of a malignant renal process associated with multiple pulmonary lesions suggestive of metastases. The lung biopsy returned in favor of CCRC. Histological examination of the right arm mass confirmed the secondary muscular involvement of the renal process. The rarity of muscle metastases from CCRC represents a true diagnostic challenge, warranting systematic investigation.