Fibrosarcoma may occur at any age but is the most common at 30 to 55 years of age. We experienced two cases of fibrosarcoma occurring in childhood. One patient was a 10-year-old girl, suffering from a slowly enlarging mass in the right iliac. We diagnosed her as fibrosarcoma from pathologic findings at biopsy. We excised it with a wide margin of normal tissue. There was no recurrence identified on MRI seventeen months following the surgery. The other patient was a 8-year-old girl, who underwent excision of a right shoulder mass marginally in another hospital and was diagnosed as low grade myxofibrosarcoma. We excised it with a 3 cm margin. There was no recurrence identified on MRI 11 months following the surgery. Fibrosarcomas are rare in children, and there are only a few reports on the effects of radiation and chemotherapy. We need to continue careful follow-up.
