Bilateral Internal Carotid Artery Hypoplasia with Craniofacial Anomalies: A Case of Suspected Treacher Collins Syndrome.

Internal carotid artery aplasia or hypoplasia above the cervical bifurcation is rare, occurring in less than 0.01% of the general population. Unilateral neurocristopathy complicated by unilateral internal carotid artery agenesis or hypogenesis has been reported, but bilateral internal carotid artery hypoplasia is rare and scarcely reported. Herein, we report a novel case of Treacher Collins syndrome complicated by bilateral internal carotid artery hypoplasia. A 94-year-old woman presented with complaints of headache and vomiting. Computed tomography revealed a subarachnoid hemorrhage and dysplasia of the bilateral zygoma, mandible, and external auditory meatus. The patient had severe hearing loss and visual impairment. Computed tomography angiography revealed bilateral internal carotid artery hypoplasia and multiple aneurysmal changes in the intracranial arteries. We diagnosed the patient with a ruptured anterior inferior cerebellar artery aneurysm and performed coil embolization. The patient's unique facial features were consistent with neurocristopathy, especially Treacher Collins syndrome. Developmental anomalies of neural crest cells can present as vascular abnormalities and craniofacial malformations. Special care is required for endovascular treatment and airway management in cases of neurocristopathy because of the specific craniofacial anomalies.