[18F]FDG PET-CT in Weber-Christian Disease.

A 46-year-old woman with relapsing fever and painful pelvic subcutaneous nodules was referred to our center for a second opinion. Despite antibiotic and corticoid treatment, inflammation markers remained high. FDG-PET/CT was performed to evaluate the possible cause of her clinical condition, exclude systemic disease and evaluate the extension and inflammation of the nodules. FDG-PET/CT showed multiple abdominopelvic subcutaneous soft tissue foci without visceral involvement. The review of a previous nodule biopsy revealed Weber-Christian Disease (WCD), a rare disorder characterized by idiopathic nodular panniculitis, fever, and systemic inflammation. WCD is a diagnosis of exclusion when no other cause of panniculitis can be identified.