Cyst of the medullary conus

Cyst of the medullary conus is a rare benign ependymal cyst of the conus medullaris which probably relates to abnormal persistence and cystic dilatation of the ventriculus terminalis or "5 ventricle". This entity can be symptomatic and present in adulthood with bladder or bowel sphincter disturbance.

Differential diagnosis

Filar cysts occur in a similar region but are below the conus medullaris.