Multiple myeloma (MM) is a malignant tumor of plasma cell characterized by overproduction of abnormal plasma cells in the bone marrow and skeletal destruction. The clinical features are bone pain, renal impairment, immunodeficiency, anemia and presence of abnormal immunoglobulins (Ig).

A type of retinal detachment arising from damage to the outer blood-retinal barrier that allows fluid to access the subretinal space and separate the neurosensory retina from the retinal pigment epithelium.