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KMID : 0942820040030020114
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Journal of Korean Brain Tumor Society
2004 Volume.3 No. 2 p.114 ~ p.119
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Morphological Analysis of the Tentorial Notch using Magnetic Resonance Imaging
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Cho Sung-Min
Lee Ho-Kook
Pyen Jhin-Soo
Hong Soon-Ki
Kim Hun-Joo
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Abstract
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Objective: This study was performed to measure anatomical basis for interpretation of the tentorial notch, oculomotor nerve and brainstem using MRI and to develop a classification system for the tentorial notch.
Methods: From January 2002 to September 2002, we analized 100 patients with mild head injury who didn’t have space occupying lesion on the magnetic resonance imaging(MRI). The following measurements were done：1) anterior notch width(ANW)；2) maximum notch width(MNW)；3) notch length(NL)；4) posterior tentorial length(PTL)；5) interpedunculoclival(IC) distance；6) apicotectal(AT) distance；and 7) inter-third nerve angle. Quatile groups defined by NL were labeled long, short, and midrange, and those defined by MNW were labeled as wide, narrow, and midrange.
Results: The patients were composed of 64 men and 36 women whose mean age was 29.6±15.7 year of age(range 2-61). Mean values are presented as the means±standard deviations into following variations：1) ANW, 22.3±4.4mm；2) MNW, 32.9±3.6mm；3) NL, 57.6±5.4mm；4) PTL, 30.4±3.0mm；5) AT distance, 25.2±4.8mm；6) IC distance, 18.0±4.9mm；7) inter-third nerve angle, 50.8±6.9°. The types of tentorial notch were wide(16%), narrow(11%), long(12%), short(12%), and typical(17%). Notches that were both wide and long were labeled large(8%), and those that were narrow and short were labeled small(12%). The category of mixed notches(12%) was assigned to tentorial notches that were either wide/short(4%) or narrow/long(8%).
Conclusions: The use of MRI to identify the type of tentorial notch and regional anatomy may help neurosurgical decision making.
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KEYWORD
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Tentorial notch, MRI
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