[Soft tissue tumors with difficult to distinguish boundaries. From myxoma to myxofibrosarcoma: a case report].

Myxofibrosarcoma is a slow-growing subcutaneous tumor found in the older patient. Because of its deceptive macroscopic and histologic appearance, it is often misinterpreted as a benign lesion. We report a case of this tumor in a young woman recurring five times before the final diagnosis was made. Since recurrence may lead to tumor progression and increases the risk of metastasis, accurate diagnosis and radical removal of the lesion are extremely important. Eight benign and malignant myxoid tumors that have to be considered as differential diagnosis are reviewed.