Apparent posterior cerebral artery territory perfusion asymmetry on arterial spin labeling MRI is a common non-pathologic finding in patients with a unilateral fetal posterior cerebral artery

To determine the frequency of apparent posterior cerebral artery (PCA) territory asymmetry seen on arterial spin labeling (ASL) imaging in patients with a unilateral fetal PCA, but without underlying clinical or imaging pathology to suggest true hypoperfusion.A search of radiology reports from 1/2017 through 6/2020 was performed with the inclusion term "fetal PCA." Eighty patients were included with unilateral fetal PCA confirmed on MRA or CTA,...