The ventriculus terminalis, an anatomical variant, is a small, ependymal-lined, oval, cystic structure positioned at the transition from the tip of the conus medullaris to the origin of the filum terminale.
It represents the result of canalization and retrogressive differentiation of the caudal end of the developing spinal cord and regresses in size during the first weeks after birth.
Irrespective of the modality used to image the spine, a ventriculus terminalis appears as a cystic structure at the tip of the conus medullaris, extending over 8 - 10 mm and with a transverse diameter of 2 - 4 mm.
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