<unk>  is a secondary cancer of the subarachnoid space, meninges and pia matter from a primary tumor source. It is one of the dreaded complications of terminal malignancy. It could be from a distant metastasis or from a primary brain tumor. Most commonly documented primary distant source is beast cancer.
Neoplastic meningitis
Fungal meningitis
Viral meningitis
Tuberculous meningitis
Acute hemorrhagic leukoencephalitis
Primary amoebic meningoencephalitis
Mollaret's meningitis
Herpes simplex encephalitis