Abstract
We report a case of desmoid tumor originating from the peroneal nerve. The patient was an 18-year-old man who had been aware of pain in his left leg for 2 years. The pain had gradually increased, and he had also noticed paresthesia of left leg and a dropped foot 1 year later, and therefore consulted us. CT and MRI showed a 13x8-cm tumor on his buttock. This was diagnosed as desmoid tumor by open biopsy, and resection was performed. The tumor was resected en bloc with the peroneal nerve. Pathological examination revealed that the desmoid tumor had originated from the peroneal nerve. Currently, the dropped foot and paresthesia still remain, but the tumor has not recurred after two years of follow-up. However, careful long-term observation will be necessary.
