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Heat zapps bone tumors

A team of radiologists and orthopedic specialists at Johns Hopkins Medicine has successfully used heat generated by electrode-tipped probes to destroy painful, benign bone tumors in eight of nine patients in a clinical study.

The results of the study, published in the March issue of the Journal of Vascular Interventional Radiology, suggests a need for further research to confirm the effectiveness of percutaneous radiofrequency for treating osteoid osteomas.

In the study, all eight patients achieved complete pain relief after thin probes were inserted through the skin into the core of the bone tumor, and radiofrequency energy was used to produce enough heat to destroy the tumor at its biological core. Five patients underwent the procedure with guidance provided by a new type of fast CT scanner incorporating CT fluoroscopy at 13 frames a second in three places at once.

Osteoid osteomas account for up to 12 percent of all benign bone tumors and occur primarily in children and young adults, according to Kieran Murphy, M.D., director of neurointerventional radiology at Hopkins and a member of the study team. While not life-threatening, the tumors can be extremely painful.

Standard treatment consists of nonsteroidal anti-inflammatory drugs. However, when pain is severe and/or long-term conventional drug treatment causes complications, surgical removal is the usual alternative.

Murphy notes that while the reported success rate for such surgery is very high, it carries some risks. "Depending on the size of the bone tumor, bone fractures can occur at the site of the tumor removal and bone grafting may be required," he says.

While all eight of the patients benefitted, three achieved success only after re-treatment. Initial failures were attributed to the use of fluoroscopy alone for tumor localization, which provided less precise tumor images than did CT fluoroscopy. One patient eventually required surgical removal of th
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Contact: Gary Stephenson
gstephenson@jhmi.edu
410-955-5384
Johns Hopkins Medical Institutions
12-May-2003


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