Extranodal Diffuse Large B-Cell Lymphoma (DLBCL) Presenting as Diffuse Joint Pain: A Diagnostic Dilemma.

Diffuse Large B-Cell Lymphoma (DLBCL) of bone is a rare presentation of Non-Hodgkin Lymphoma (NHL), which remains asymptomatic or present late in clinical course as bone pain or pathological fracture. We report a case of a 15-year-old male child presenting with diffuse joint pain and swelling over his left shoulder and elbow, associated with B symptoms. Radiological examination revealed lytic lesions in multiple bones along with collection along the left iliopsoas and hip joint, suggestive of infective etiology. The diagnostic dilemma was resolved on biopsy, which confirmed DLBCL involving bones and soft tissue.