Abstract
Alveolar soft part sarcoma (ASPS) is a rare disease that is usually confused with other vascular lesions. We describe a case of progressive swelling of the left lower leg for more than one month before hospitalization. A hemangioma was suspected initially, based on preoperative computerized tomography and angiography imaging. The patient underwent surgical excision of the lesion. Surprisingly, the pathology revealed an ASPS. In the literature, without appropriate radiographic studies ASPS has been misdiagnosed occasionally as a hemangioma or arteriovenous malformation, and misdiagnosis has led to failure to excise the tumor without an adequate safe margin. We report this case to emphasize the importance of magnetic resonance imaging (MRI) in the preoperative diagnostic workup. MRI can differentiate accurately between these lesions, because an ASPS demonstrates a high signal on T1- and T2-weighted images.
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