Ventriculus Terminalis - Fifth Ventricle

ventriculus terminalis - fifth ventricle ax
sag T2, ax T2, ax T1 C+, ax T1 C+ FS

ventriculus terminalis - fifth ventricle sag
sag T2, T1 C-, T1 C+, T1 C+ FS

As additional finding at MRI of Lumbar spine an oval cystic lesion with thin well demarcated wall without contrast enhancement located in conus medullaris. This is a ventriculus terminalis also known as fifth ventricle. It represents developmental remnant and is believed to have no clinical significance. It has typical location and lack of enhancement differentiates it from other cystic lesions in the spine as for example hemangioblastoma. 

See also this interesting article:

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