<unk>  is the inflammation of the meninges, a membrane covering the brain and spinal cord, in patients whose cerebral spinal fluid test result is negative with routine bacterial cultures.<unk>  is caused by viruses, mycobacteria, spirochetes, fungi, medications, and cancer malignancies. The testing for both meningitis and<unk>  is mostly the same. A cerebrospinal fluid sample is taken by lumbar puncture and is tested for leukocyte levels to determine if there is an infection and goes on to further testing to see what the actual cause is. The symptoms are the same for both meningitis and<unk>  but the severity of the symptoms and the treatment can depend on the certain cause. The most common cause of<unk>  is by viral infection. Other causes may include side-effects from drugs and connective tissue disorders.
Aseptic meningitis
Fungal meningitis
Viral meningitis
Drug-induced aseptic meningitis
Herpesviral meningitis
Viral encephalitis
Tuberculous meningitis
Granulomatous meningoencephalitis