Metastatic malignant melanoma in muscle.

A case is reported in which metastatic melanoma had extensively infiltrated the sartorius muscle which had been used earlier to cover the femoral vessels at the time of an inguinal node dissection. The patient also had a swelling in the ipsilateral popliteal fossa that was thought to be a metastasis from the primary malignant melanoma of the foot: however, on exploration, this mass was found to be a Baker's cyst.