Parosteal osteosarcoma is classified as a low-grade osteosarcoma. Most reported cases involve the femur and other long bones, whereas rib involvement is extremely rare. The prognosis is relatively favorable. The primary treatment is surgical resection.
A 57-year-old man presented with a subcutaneous mass and pain in the right back. Imaging findings suggested a malignant tumor. Biopsy revealed parosteal osteosarcoma arising from the ribs. After resection of the enlarged tumor, chest wall reconstruction with a latissimus dorsi musculocutaneous flap was performed. No recurrence has been observed 30 months after surgery. Impairment of postoperative respiratory function was not observed.
