Multicentric reticulohistiocytosis with pulmonary involvement.

Multicentric reticulohistiocytosis (MRH) is a rare and possibly devastating systemic disorder characterized by tissue infiltration by histiocytes and multinucleated giant cells. The disease commonly involves the skin, joints, and mucous membranes, with the rare involvement of other organ systems. We describe a patient with MRH presenting with papules and nodules on both hands and a rapidly progressive arthritis who may have had pulmonary involvement of the disease.