PMC4732250_01
Digital subtraction angiogram (DSA). (a) Angiogram of the venous phase (lateral view) reveals non-visualization of the deep venous system. Rim of the VGAM (small arrows) and the straight sinus (arrowhead) are faintly visible. Falcine sinus is not seen. (b) Arterial phase posterior circulation (AP view): No prominent thalamoperforators or other arterial feeders are noted
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F1
Deep venous system was not visualized [Figure 1].
(a) T1-weighted MRI sagittal view (post-contrast) shows enhancement of the periphery of the VGAM with compression of the tectal plate and aqueduct causing obstructive hydrocephalus. (b) T2-weighted MRI axial view reveals heterointense signals suggestive of varying stages of bleed within the lesion
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F2
Magnetic resonance imaging (MRI) revealed a thrombosed VOGM [Figure 2].
CT head performed at follow-up shows decreased ventricle size and decreasing size of VGAM with areas of calcification around the rim. Shunt tip is seen in left frontal horn, and sulci and gyri are better seen
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F3
Follow-up CT showed reduction in the size of VOGM and ventricle [Figure 3].