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 Discussion of Ventriculus terminalis
- The ventriculus terminalis is a small, ependyma-lined, oval, cystic structure positioned at the transition from the tip of the conus medullaris to the origin of the filum terminale.
- The ventriculus terminalis develops during embryogenesis as a 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.
- This variant causes no clinical symptoms.
 Imaging Findings for Ventriculus terminalis
- Cystic structure at the tip of the conus medullaris with a longitudinal diameter of 8–10 mm and a transverse diameter of 2–4 mm.
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 References for Ventriculus terminalis
- Karin M. Unsinn, Theresa Geley, Martin C. Freund, and Ingmar Gassner. US of the Spinal Cord in Newborns: Spectrum of Normal Findings, Variants, Congenital Anomalies, and Acquired Diseases. RadioGraphics 2000 20: 923-938.