Anomalous hyperplastic anterior choroidal artery and its mimicker: a case series.

The anomalous hyperplastic anterior choroidal artery (AchoA) is a rare anomaly due to incomplete distal annexation between the primitive AchoA and posterior cerebral artery (PCA). It is often misdiagnosed or misunderstood as a duplicated or fetal type PCA because of its supply distribution. In addition, its aneurysm incidence is much higher than the overall aneurysm incidence of AchoA. Thus, endovascular procedures or surgery without comprehensive understanding of this anomaly can cause critical complications. Herein, we present a case series of anomalous hyperplastic AchoA and its mimicker, along with schematic images for comprehensive understanding.