Meningeal Carcinomatosis

**Definition:** Primary or secondary neoplasm in the ARACHNOID or SUBARACHNOID SPACE. It appears as a diffuse fibrotic thickening of the MENINGES associated with variable degrees of inflammation.

**Tree numbers:** - C04.588.614.250.580.150 - C10.551.240.500.150

**Synonyms:** - Carcinomatous Meningitis - Leptomeningeal Carcinomatosis