Internal carotid artery (ICA) agenesis is an infrequent vascular anomaly, less than 0.01 % of the population. Here we report a case of internal carotid agenesis with a rare collateral pathway, via supraclinoid ICA anastomosis to the contralateral supraclinoid ICA.
Jung Hee Hong et al. (2016). Internal carotid artery agenesis associated with a rare collateral pathway: supraclinoid-supraclinoid anastomosis. A case report. Surgical and Radiologic Anatomy., 38(2), 261–263. doi: 10.1007/s00276-015-1531-7