• Internal medicine · Mar 2022

    The "Ant-farm"-like Appearance of Restricted Lower Limb Vasculitis on Fluorodeoxyglucose-positron Emission Tomography: A Case Series.

    • Shintaro Yamamoto, Tomoyuki Mukai, Shunichi Fujita, Yuka Koide, Yumika Ono, Masayuki Inubushi, Hirotake Nishimura, Asami Munekane, and Yoshitaka Morita.
    • Department of Rheumatology, Kawasaki Medical School, Japan.
    • Intern. Med. 2022 Mar 15; 61 (6): 897-902.

    AbstractRestricted lower limb vasculitis is a type of localized muscle vasculitis limited to the lower limbs. The usefulness of fluorodeoxyglucose-positron emission tomography (FDG-PET) for the diagnosis of this entity has not yet been reported. We herein report three patients with a fever and persistent lower limb pain. FDG-PET revealed linear and patchy FDG uptakes in their lower limbs. Combined with magnetic resonance imaging and histological findings, they were diagnosed with lower limb vasculitis. Linear and patchy FDG uptakes are considered to reflect the presence of muscle vasculitis. The characteristic "ant-farm"-like FDG-PET images can be a diagnostic clue for the currently overlooked vasculitis.

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