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Synchronous Urinary Bladder and Gluteal Muscle Metastases of Malignant Melanoma: A Case Report and Review of the Literature

Malignant melanoma has been known to metastasize; several cases in the literature have reported its metastasis to the urinary bladder. Metastasis to the gluteal muscle, however, is quite unusual. We report a case of malignant melanoma metastatic lesions in the urinary bladder and gluteal muscle, with a very good response to targeted therapy despite the aggressive behavior of this disease.