Lung uptake on technetium-99m-MDP bone scan in Wegener's vasculitis

A 99mTc-MDP bone scan was performed on a 65-yr-old woman because of joint pain. The study showed bilateral lung uptake and no abnormalities of the affected joints. Wegener's vasculitis was diagnosed. Lung uptake on bone scans has been noted in various conditions but not Wegener's vasculitis. The differential diagnosis of lung uptake on bone scan should include Wegener's vasculitis.