[Percutaneous therapy of osteoid osteoma].

Osteoid osteomas are tumors with intense clinical symptoms and extensive reactive bone changes far exceeding the volume of the lesion itself. Because of their small size they can be approached by minimally invasive surgical procedures. We treated ten symptomatic patients with osteoid osteomas (n 6 hip point, n 1 iliac bone, n 1 femoral diaphysis, n 2 tibial diaphysis) by excision of the nidus with a 3-mm Harlow-Wood needle using a percutaneous CT-guided approach. Seven patients with residual tumor were treated with either thermocautery (n 2) or sclerosis with 1 ml of 96% ethanol (n 5). Six patients had instant and constant relief (3 years' observation) of their pain. In two patients a second transcutaneous intervention was successful. Only two patients needed open resection. Compared with the invasive open resection of the tumors, sometimes even putting the stability of the femoral neck at risk, transcutaneous CT-guided enucleation of the nidus of the osteoid osteoma with additional sclerotherapy is a good alternative method, especially in the region of the femoral neck.