Background: Horner syndrome (HS), also known as Claude-Bernard-Horner syndrome or oculosympathetic palsy, comprises ipsilateral ptosis, miosis, and facial anhidrosis. Case Report: We report herein the case of a 67-year-old man who presented with congenital HS associated with ipsilateral hypoplasia of the internal carotid artery (ICA), as revealed by heterochromia iridis and confirmed by computed tomography (CT). Conclusions: CT evaluation of the skull base is essential to establish this diagnosis and distinguish aplasia from agenesis/hypoplasia (by the absence or hypoplasia of the carotid canal) or from acquired ICA obstruction as demonstrated by angiographic CT.
Deprez, F., Coulier, J., Rommel, D., & Boschi, A. (2015). Congenital horner syndrome with heterochromia iridis associated with ipsilateral internal carotid artery hypoplasia. Journal of Clinical Neurology, 11(2), 192-196. https://doi.org/10.3988/jcn.2015.11.2.192 (Original work published 2015)