Visibility of the central canal on MRI

• Published in: Neuroradiology Vol. 42; no. 10; pp. 756 - 761
• Main Authors: PETIT-LACOUR, M. C, LASJAUNIAS, P, IFFENECKER, C, BENOUDIBA, F, RABIA, M. Hadj, HURTH, M, DOYON, D
• Format: Journal Article
• Language: English
• Published: Berlin Springer 01.10.2000
• Subjects: Adolescent; Adult; Aged; Biological and medical sciences; Cerebrospinal fluid. Meninges. Spinal cord; Female; Humans; Magnetic Resonance Imaging; Male; Medical sciences; Middle Aged; Nervous system (semeiology, syndromes); Neurology; Spinal Cord - anatomy & histology; Spinal Cord - pathology; Human; Nervous system diseases; Syringomyelia; Central nervous system disease; Medical imagery; Exploration; Spinal cord disease; Nuclear magnetic resonance imaging
• ISSN: 0028-3940; 1432-1920
• DOI: 10.1007/s002340000373

The central canal of the spinal cord is present at birth and becomes progressively obliterated. Cadaver studies have shown that it may persist partially or completely. To our knowledge, this entity has not been described on MRI. We reviewed 794 MRI studies of the spinal cord, and found 12 patients (aged 14 to 65 years) who had an intramedullary cavity. The cavity was at the junction of the ventral 1/3 and dorsal 2/3 of the spinal cord, except at the level of the lumbar enlargement, where it was central. It was filiform in most cases, although sometimes fusiform (3 to 4 mm in diameter), and had regular contours. The cavity were thoracic in 69 % of cases. The clinical features were totally unrelated to the image, and there were no anatomical factors (Chiari malformation, dysraphism) predisposing to syringomyelia. The images were perfectly compatible with a persistent central canal, which we interpret as a variant of normal anatomy. Therefore it is important to regard these findings as normal, to avoid unnecessary treatment and follow-up.