High-grade infiltrative myxofibrosarcoma in the forearm presenting as acute carpal tunnel syndrome.

Myxofibrosarcoma is one of the most common sarcomas in the extremities of elderly people and is characterized by a high frequency of local recurrence. We report a rare case of high-grade myxofibrosarcoma involving the forearm and presenting as acute carpal tunnel syndrome where absence of a discrete mass lesion and diffuse infiltrative nature precluded early recognition of tumor. To our knowledge, such a presentation with an extreme infiltrative growth pattern in the forearm has not been reported before.