DOI: https://doi.org/10.36347/sjmcr.2025.v13i10.097

Pages: 2593-2595

Introduction: Skeletal muscle metastases (SMM) are an exceptional occurrence in oncology, often asymptomatic and discovered incidentally on imaging. Their presence is a marker of widely disseminated disease and influences staging and prognosis. Case Presentation: We report the case of a 66-year-old male patient with no significant medical history, who presented for lower back pain. Radiological workup revealed findings highly suggestive of a primary lung carcinoma with hepatic, multiple osseous, nodal metastases, and, notably, a secondary lesion within the right gluteus maximus muscle. This picture was consistent with widespread stage IV carcinomatosis. Conclusion: This case is a rare illustration of SMM. It underscores the necessity of a meticulous analysis of all anatomical structures on imaging studies, including the musculature, during the staging of cancer. The discovery of a SMM, although rare, is a major prognostic and therapeutic element that must be systematically sought.