Preoperative CT localization and marking of osteoid osteoma: description of a new technique.

We describe a new technique for the preoperative localization of an osteoid osteoma nidus. Four lesions (mean patient age 26 years) were localized with CT. A needle was advanced into the cortex, methylene blue was injected, and a self-retaining localization wire was then left in place. A final CT image confirmed localization. The site of marking was identified intraoperatively by following the guide wire to the cortical mark, permitting nidus excision with minimal resection of bone.