18F-FDG PET/CT Demonstrating Primary Bone Lymphoma of the Extremities Mimicking an Inflammatory Peripheral Arthropathy

A 66-year-old woman presents with progressive bilateral swelling of her fingers, elbows, and toes. Initially thought to represent an inflammatory peripheral arthropathy, the patient underwent rheumatology review, but subsequent tissue biopsy confirmed diffuse large B-cell lymphoma. Results of bone marrow biopsy and staging CT were negative. F-FDG PET/CT demonstrates FDG-avid bony and adjacent soft tissue disease limited to the extremities with...