Leptomeningitis :: Leptomeningitis (n.) Inflammation of the pia mater or of the arachnoid membrane.
Meningeal :: Meningeal (a.) Of or pertaining to the meninges.
Meninges :: Meninges (n. pl.) The three membranes that envelop the brain and spinal cord; the pia mater, dura mater, and arachnoid membrane..
Meningitis :: Meningitis (n.) Inflammation of the membranes of the brain or spinal cord.
Pachymeningitis :: Pachymeningitis (n.) Inflammation of the dura mater or outer membrane of the brain.