Inflammatory pseudotumour of the infratemporal fossa visualized with 18 F-FDG PET/CT.

The inflammatory pseudotumour of the head and neck is a benign lesion, extremely rare outside the cranial orbits. A case is presented of an inflammatory pseudotumour not associated with the IgG4-related disease. The pseudotumour was found as a solitary mass in the infratemporal fossa of a young woman who complained of otalgia and hearing loss. A clear image of the lesion was obtained using an 18 F-fluoro-deoxy-glucose (18 F-FDG) PET. After the histopathological diagnosis, and treatment with corticosteroids, a second 18 F-FDG PET was performed. The metabolic image had returned to normal, and the previously observed mass disappeared. A brief review is presented of the studies examining this type of lesion.