Systemic lupus erythematosus mimicking idiopathic multicentric Castleman disease: A diagnostic dilemma.

Castleman disease is a heterogeneous group of disorders of lymphoid tissue. It can often mimic other autoimmune diseases or malignancies, presenting a diagnostic dilemma to attending clinicians. Systemic lupus erythematosus and Castleman disease share many clinical and biochemical features rendering a special diagnostic challenge.