Metastatic Malignant Neoplasm in the Leptomeninges

**Semantic type:** Neoplastic Process

**Definition:** A malignant neoplasm that has spread from its original site of growth to the leptomeninges.

**Synonyms:** - Leptomeningeal Metastases - Leptomeningeal Metastasis - Leptomeningeal metastases, NOS - Meningeal Metastasis - Metastasis to the Leptomeninges - Metastatic Malignant Neoplasm in the Meninges - Metastatic Malignant Neoplasm to the Leptomeninges - Metastatic Malignant Neoplasm to the Leptomeninges - Metastatic Neoplasm to the Leptomeninges - Metastatic Neoplasm to the Meninges - Metastatic Tumor to the Leptomeninges - carcinomatous meningitis - leptomeningeal carcinoma - leptomeningeal metastasis - meningeal metastasis - neoplastic meningitis