 Redemonstrated is a distal left M1 aneurysm at the bifurcation, measuring approximately 4 x 4 mm in diameter. There is also a 2 x 2 mm posterosuperiorly directed outpouching from the mid-left M1 segment which was present on the prior MRI and is unchanged. Along the distal right M1 segment at the bifurcation is a third aneurysm directed superiorly, measures 2 x 2 mm, was present previously, and is unchanged.The intracranial internal carotid arteries and anterior cerebral arteries are unremarkable. The vertebral arteries, basilar artery, and posterior cerebral arteries are normal in course and caliber. The bilateral PComA are not visualized. There is no evidence of flow-limiting stenosis.
1.Unchanged appearance of the 4 mm distal left M1 segment aneurysm at the bifurcation.2.Two additional smaller aneurysms, including a posterosuperiorly directed 2 mm aneurysm along the left mid-M1 segment and a superiorly directed 2 mm aneurysm along the distal right M1 segment at the bifurcation are also not significantly changed. 