OBJECTIVETo evaluate the methods of CT-guided percutaneous removal of osteoid osteoma.

METHODSFrom February 2003 to December 2003, there were 11 patients, at a mean age of 19.3 years old (from 14 to 32 years old). Seven cases were male, and 4 cases were female. Diagnosis was supported by the complete clinical and imaging file. Eleven cases with osteoid osteomas were treated with CT-guided percutaneous excision. The location involved were femoral neck (6 cases), acetabulum (4 cases), humeral neck (1 case). At first, CT scanning was done in the whole nidus with thin slices (2 mm thick), and the CT scan slice passing through the center of the nidus was selected. Then the whole nidus was removed by trephine along the guidewire which was inserted into the bone up to the nidus and was protected by the trocar. Finally complete lesion resection was checked with CT.

RESULTSNine cases had a final pathological diagnosis of osteoid osteomas. Complete pain relief was obtained in these patients after the day of operation. There were no complications, no recurrence and patients remained symptom free at follow-up of 8-18 months (mean, 15.2 months).

CONCLUSIONThe methods of CT guided percutaneous removal of osteoid osteoma is a minimally invasive technique that represents the efficacy and safety.