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Vascular malformations involving the muscles around the knee can be a cause of knee pain. We studied ten such cases. All underwent magnetic resonance (MR) imaging which confirmed the diagnosis. Eight cases underwent wide surgical excision of the lesion, histology of which showed a vascular malformation with predominantly venous element. There was no recurrence in any of the operated cases at the last follow-up. We believe that most of these lesions can be treated successfully by careful preoperative planning aided by MR imaging and a wide-open excision of the lesion. [Copyright &y& Elsevier]