Document Detail

The aqueduct of Sylvius: applied 3-T magnetic resonance imaging anatomy and morphometry with neuroendoscopic relevance.
MedLine Citation:
PMID:  23615083     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The aqueduct of Sylvius (AqSylv) is a structure of increasing importance in neuroendoscopic procedures. However, there is currently no clear and adequate description of the normal anatomy of the AqSylv.
OBJECTIVE: To study in detail hitherto unavailable normal magnetic resonance imaging morphometry and anatomic variants of the AqSylv.
METHODS: We retrospectively studied normal midsagittal T1-weighted 3-T magnetic resonance images in 100 patients. We measured widths of the AqSylv pars anterior, ampulla, and pars posterior; its narrowest point; and its length. We recorded angulation of the AqSylv relative to the third ventricle as multiple deviations of the long axis of the AqSylv from the Talairach bicommissural line. We statistically determined age- and sex-related changes in AqSylv morphometry using the Pearson correlation coefficient. We measured angulation of the AqSylv relative to the fourth ventricle and correlated this to the cervicomedullary angle (a surrogate for head position).
RESULTS: Patients were 13 to 83 years of age (45% male, 55% female). Mean morphometrics were as follows: pars anterior width, 1.1 mm; ampulla width, 1.2 mm; pars posterior width, 1.4 mm; length, 14.1 mm; narrowest point, 0.9 mm; and angulation in relation to the third and fourth ventricles, 26° and 18°, respectively. Age correlated positively with width and negatively with length of the AqSylv. There was no correlation between AqSylv alignment relative to the foramen magnum and the cervicomedullary angle.
CONCLUSION: Normative dimensions of the AqSylv in vivo are at variance with published cadaveric morphometrics. The AqSylv widens and shortens with cerebral involution. Awareness of these normal morphometrics is highly useful when stent placement is an option during aqueductoplasty. Reported data are valuable in guiding neuroendoscopic management of hydrocephalus and aqueductal stenosis.
Tomasz Matys; Avril Horsburgh; Ramez W Kirollos; Tarik F Massoud
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Neurosurgery     Volume:  73     ISSN:  1524-4040     ISO Abbreviation:  Neurosurgery     Publication Date:  2013 Dec 
Date Detail:
Created Date:  2013-11-22     Completed Date:  2014-07-15     Revised Date:  2014-11-06    
Medline Journal Info:
Nlm Unique ID:  7802914     Medline TA:  Neurosurgery     Country:  United States    
Other Details:
Languages:  eng     Pagination:  ons132-40; discussion ons140     Citation Subset:  IM    
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MeSH Terms
Adenoma / surgery
Age Factors
Aged, 80 and over
Cerebral Aqueduct / pathology*,  surgery
Cohort Studies
Imaging, Three-Dimensional*
Magnetic Resonance Imaging*
Middle Aged
Neuroendoscopy / methods*
Pituitary Neoplasms / surgery
Retrospective Studies
Sex Characteristics
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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