Demonstration of the optic pathway in large pituitary adenoma on heavily T2 weighted MR images

British Journal of Neurosurgery
M EdaK Sunami

Abstract

The objective of the investigation was to understand preoperatively the detailed anatomical relationship of large pituitary adenomas to surrounding structures, using the heavily T2-weighted reversed (T2R) MR images. This study consisted of 28 patients with pituitary adenoma, presenting with visual disturbance. The MRI scanner used was a Gyroscan ACSNT 1.5T and the slice thickness of the image was 3 mm with 0.5 mm interslice gap. The relation of pituitary adenoma to optic pathway and to the degree of visual field defect was assessed. Relations of the optic chiasm to adenoma were classified into three types: anterior, superior and posterior. The optic chiasm was directly visualized and identifiable in all patients studied. It was located anterior in four cases, superior in 22 and posterior in two in relation to the adenoma. Its location was further confirmed by the anatomical delineation of surrounding structures such as anterior commissure and lamina terminalis. Optic nerve or tract was unidentifiable in one case, for each category. Detectability of each optic component was higher on T2R images than on conventional T1-weighted images. The adenoma extended into and in front of the third ventricle in anterior and posterior types, ...Continue Reading

Citations

Mar 17, 2009·Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia·Geeta ChackoBernd W Scheithauer
Mar 25, 2014·Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia·Siddharth OgraHelen V Danesh-Meyer
Jul 20, 2010·Pituitary·Geeta ChackoM S Seshadri
Jul 9, 2016·Journal of Neuro-ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society·Won Hyung A RyuUNKNOWN PITNET Study Group
Nov 10, 2010·The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques·Won Hyung A RyuNeil Duggal
Dec 15, 2018·Korean Journal of Ophthalmology : KJO·Dong Kyu LeeSang Woo Park
Feb 25, 2021·International Ophthalmology·Su Hwan ParkSu Jin Kim

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