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Remote arterial vasculitis as a possible complication of Phosphorus-32 Radiosynovectomy.

Radiology Case Reports 2019 Februrary
Patients with hemophilia suffer from repeated episodes of hemarthrosis leading to chronic inflammation and synovitis. Radiosynovectomy is an effective nonsurgical modality that can reduce inflammation, pain, and hemarthrosis in such cases. We describe an adolescent male with severe Hemophilia A, who developed arterial vasculitis and perivasculitis targeting the brachiocephalic, right common carotid, and right subclabvian arteries occurring within few days after difficult Phosphorus-32 radiosynovectomy, possibly as a complication of the procedure. Despite prophylaxis with recombinant FVIII therapy, he developed chronic synovitis and underwent radionuclide synovectomy with P-32 injection to the left ankle and right knee. Five days later, he developed pain in the lower right neck and right upper chest. Computed tomography and magnetic resonance imaging and angiography demonstrated inflammation involving the arteries of the right thoracic inlet. Geiger-Mueller meter indicated increased radioactivity not only in the left ankle and right knee but also in the right upper chest. Detection of radioisotope at the right thoracic inlet corresponding to the area of vasculitis was indicative of likely deposition of the P-32 isotope in an area exposed to maximum cardiac output and increased blood flow, leading to subclavian, carotid, and innominate arteritis with surrounding edema.

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