Monarch Disease Ontology term MONDO_0003762 (malignant leptomeningeal tumor) is a primary or metastatic malignant tumor involving the leptomeninges. Also known as: cancer of leptomeninx, leptomeninx cancer, malignant leptomeningeal neoplasm, malignant leptomeninx neoplasm, malignant neoplasm of leptomeninx, malignant tumor of leptomeninges, malignant tumour of leptomeninges.