Leptomeningeal Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A malignant neoplasm that has spread from its original site to the two innermost layers of tissue that cover the brain and spinal cord.

**Synonyms:** - LEPTOMENINGEAL DISEASE - Leptomeningeal Tumor - Neoplasm of Leptomeninges - Neoplasm of the Leptomeninges - Tumor of Leptomeninges - Tumor of the Leptomeninges