¹⁸F-FDG PET/CT aids the diagnosis of adult onset Still's disease in a patient with fever of unknown origin.

A 28-year-old male patient was presented with pain and restriction of left hip movement since 18 months, mild to moderate intermittent fever since 8 months and generalized bodyache since 1 month. His physical examination revealed axillary lymphadenopathy and hepatomegaly. His hemoglobin was 9.5 gm/dl (normal 12–16 gm/dl) and total leukocyte count was 14,200/mm3 (normal 4000–11000/mm3) with 62% neutrophils. Other inflammatory markers were raised [ESR-105 mm in 1st hour, CRP-81.5 mg/dl, ferritin-1487 ng/ml (normal values <25 mm in 1st hour, <2 mg/dl and 50–150 ng/ml respectively)]. Screening for infectious disease was negative (sterile blood and urine culture, negative for malaria and RK-39 antigen and normal widal titer). Bone marrow examination revealed normal cellular morphology. Liver and kidney function tests were normal. His rheumatoid factor (RF) and