PMC5875110_01
Axial Maximum Intensity Projection (MIP) image of a CT angiogram showing dilation of the frontal and temporal horns of the lateral ventricle and the anterior third ventricle (white arrow). The basilar bifurcation (black arrow) is seen at the posterior end of the third ventricle
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F1
No intracranial hemorrhage was seen [Figure 1].
(a) Axial T2W, MRI image at almost a similar level showing, residual ventricular dilation and mild periventricular edema after insertion of the ventricular drain (small associated right frontal sub-galial collection). Note the basilar artery bifurcation (black arrow) indenting the posterior end of the dilated third ventricle. (b) Sagittal contrast-enhanced T1W image showing the elongated basilar artery (black arrow) elevating and causing compression and collapse of the posterior third ventricle. Contrast this with the dilated anterior third ventricle (white arrow). (c) Lateral MIP of a Time of Flight (TOF) MRA confirming the elevation of the basilar bifurcation (black arrow) above the carotid syphon (white arrow) normally situated lateral to the sella turcica
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F2
This revealed residual dilatation of both lateral and the anterior part of the third ventricle [Figure 2].