Neurology
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P. De Bonis, MD, F. Novegno, MD, G. Tamburrini, MD, C. Anile, MD, A. Pompucci, MD and A. Mangiola, MD

From the Institute of Neurosurgery, Catholic University School of Medicine, Rome, Italy.


Figure 118
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  		Figure 1 First MRI examination

The first MRI examination revealed the presence of supratentorial ventriculomegaly out of proportion to sulcal atrophy, rounded frontal horns, and transependymal CSF flow in the form of periventricular high signal on T2-weighted FLAIR images.

 

Figure 218
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  		Figure 2 T2-weighted images

(A, B) Preoperative T2-weighted images revealing a space-occupying suprasellar prepontine arachnoid cyst (arrows), displacing superiorly the third ventricle floor, the pituitary stalk and the optic chiasm, and, posteriorly, the mammillary bodies. (C, D) Postoperative T2-weighted images demon-strating a more horizontal orientation of chiasm and third ventricle floor. The cyst has shrunk (arrows).

 




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