Surveillance FDG PET/CT was performed in a 75-year-old woman with history of melanoma and colon cancer. She had rash and erythematous papules on the forearms, elbows, knees, and thighs and then developed right-leg weakness, difficulty with fine motor movement, and ptosis. Chest CT identified a right-lung spiculated nodule. Skin and pulmonary nodule biopsies showed lymphohistiocytic infiltrate with granulomatous features, without lymphoid cells, metastatic carcinoma or melanoma cells, or microorganisms. Epstein-Barr immunostain result was negative, making lymphomatoid granuloma unlikely. The inflammatory process involved the peripheral vasculature on FDG PET, and given the related neuropathy, findings were compatible with granulomatous vasculitis.
View details for PubMedID 23510876