Extramedullary Disease in Multiple Myeloma

**Semantic type:** Finding

**Definition:** Infiltration of organs and soft tissues by malignant (clonal) plasma cells in patients with history of multiple myeloma. Skin, liver, lymph nodes, pleura, and central nervous system are the most frequently affected sites.

**Synonyms:** - Extramedullary Disease in Plasma Cell Myeloma - Extramedullary Manifestation in Multiple Myeloma - Extramedullary Manifestation in Plasma Cell Myeloma