Case report. Elbow monoarthritis revealing B cell non-Hodgkin's lymphoma.

Skeletal involvement is described in 25% of patients with non-Hodgkin's lymphoma, typically as secondary, rarely as primary lymphoma of bone. Joint infiltration is very rare and monoarthritis can be a secondary synovial reaction to adjacent bone disease or direct synovial involvement. We describe an unusual case of monoarthritis of the elbow in a middle-aged man without signs and/or symptoms associated with malignancy and with no previous rheumatic disease.