There is a residual filling of the left PCom aneurysm neck measuring approximately 5.0 x 5.6 mm (depth x width). There is a new saccular aneurysm in the C2 extracranial segment of the left internal carotid artery, cranially orientated, measuring approximately 5.2 x 5.7 mm (depth x width). The remainder of the circle of Willis MRA has normal flow signal, with no high-grade stenosis, vascular malformations, or other aneurysms. No intra or extraaxial masses, collections, or regions of restricted diffusion are identified.
Conclusion: There is a new extracranial left internal carotid artery false aneurysm. Residual filling at the neck of the coiled left PCom aneurysm.