Sacral osteoid osteoma and osteoblastoma: a report of 13 cases.

The authors present 13 cases (nine males and four females) of osteoid osteoma and osteoblastoma of the sacrum. All patients were less than 20 years old. Clinical and radiographic findings, histological features, and therapy of these rare lesions are discussed. Surgical excision with a posterior approach is considered the treatment of choice, except for tumors localized in the body of S-1, which require an anterior approach. The prognosis is good, even when the neoplasm has been incompletely removed. Nevertheless, a marginal or wide resection is the recommended surgical treatment. Radiotherapy is necessary only for inoperable tumors.