PMC5820894_01
Preoperative images (a) gadolinium enhanced magnetic resonance image of brain; (b) plane computer tomography scan brain showing cerebellopontine angle mass lesion, vertebral angiogram; (c) three-dimensional reconstructed image; (d and e) posterior view; (f) lateral view
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F1
Magnetic resonance images and computer tomography (CT) scanning revealed a well-defined extra-axial lesion in the right CP angle cistern measuring 18 mm x 18 mm x 15 mm [Figure 1a and b]. AICA and the PICA territory [Figure 1c-f]. A large partly thrombosed saccular aneurysm was seen arising from the meatal segment with a patent lumen measuring 11 mm x 8 mm.