Congenital aplasia of the internal carotid artery

Introduction: Agenesis, aplasia, and hypoplasia of the internal carotid artery (ICA) are very rare congenital anomalies, occuring in less than 0.01% of the population. We report a case of congenital absence of ICA incidentally diagnosed by extracranial Duplex sonography (ECD) and confirmed by magnetic resonance imaging (MRI) and MRI-angiography. Case report: A 57-year-old healthy man presented with a bruit over the right internal and external carotid arteries. ECD demonstrated a hypoplastic right common carotid artery (CCA) and a relatively large external carotid artery (ECA). The ICA could not be seen on imagin…