Conus medullaris arachnoid cyst presenting as cauda equina s
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Arachnoid cysts are benign cerebrospinal fluid-filled sacs. Pathologically, cyst walls are formed from splitting of the arachnoid membrane, with an inner and outer leaflet surrounding the cystic cavity. Spinal intradural arachnoid cysts can be asymptomatic. Neuropathic pain, gait disturbances, paresthesias, paraparesis, or quadriparesis, are the usual presentations. This article reports a rare intradural arachnoid cyst, at the level of conus medullaris that presented as cauda equina syndrome.The patient had an arachnoid cyst reported at the level of conus medullaris on a magnetic resonance imaging (MRI) 4 years ago when he had lower back pain with leg radiation. His pain settled with medications and the patient was symptom-free since then. A repeat MRI of Dorsolumbar Spine was done, which showed an increase in the size of the cyst. He underwent laminectomy for excision of an arachnoid cyst, at the level of L1 and L2.

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