Breast Cancer Metastatic to Gluteus Maximus: A Case Report

Breast cancer rarely metastasizes to skeletal muscle. Moreover, skeletal muscle is a rare site of metastasis for any type of cancer. In this study, we report an unexpected finding of an enlarged mass in the gluteus maximus of an asymptomatic patient with a distant history of breast cancer. The mass was observed during computed tomography evaluation in preparation for a non-oncologic procedure. Biopsy and pathological investigation confirmed breast cancer metastasis. An increased awareness of rare metastatic sites is important so that such lesions are critically evaluated during early imaging examination.