There is a berry aneurysm arising from the supraclinoid portion of the left internal carotid artery, measuring 16 mm AP x 13.5 mm CC x12 mm LAT with a 5-mm neck. The aneurysm projects medially and inferiorly from its origin and encroaches on the optic chiasm and pituitary fossa. The pituitary infundibulum may be displaced posteriorly.Berry Aneurysm Gould CFG - MedPix Images (2008). Not Altered. CC.