Arachnoiditis

Arachnoiditis
Myelogram showing arachnoiditis in the lumbar spine
Illustration of Arachnoiditis
Specialty	Neurosurgery

Arachnoiditis is an inflammatory condition of the arachnoid mater or 'arachnoid', one of the membranes known as meninges that surround and protect the central nervous system. The outermost layer of the meninges is the dura mater (Latin for hard) and adheres to inner surface of the skull and vertebrae.^[1] The arachnoid is under or "deep" to the dura and is a thin membrane that adheres directly to the surface of the brain and spinal cord.^[1]