Cyst of the medullary conus

Last revised by Mostafa El-Feky on 23 Mar 2021

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 "5th 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. 

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Cases and figures

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  • Case 2
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