This case demonstrates the absence of the main trunk of the right middle cerebral artery (MCA). It is not a result of arterial occlusive disease, as there are no ischemic or post-ischemic changes in the right MCA territory, which would inevitably occur in the case of occlusion of such a significant cerebral artery. Instead, it is a developmental anomaly known as a twig-like MCA.

Additionally, there is an incidental variant anatomy of the right posterior cerebral artery (PCA) with a fetal origin, along with a developmental venous anomaly (DVA) of the right frontal lobe.