Multiple Myeloma: A Rare Presentation As Unilateral Pleural Effusion.

Multiple myeloma (MM) is a hematologic malignancy characterized by the clonal proliferation of plasma cells in the bone marrow. It commonly presents with bone pain, anemia, renal failure, and hypercalcemia. Pleural effusion in MM usually has multiple causes, but it is rare for the effusion to be due to myelomatous deposition of the pleura.