Pure Infarct of the Oculomotor Nucleus With Fetal Posterior Cerebral Artery Involvement

Vascular anomalies are present in the posterior circulation. In the case of this stroke patient, the posterior cerebral artery (PCA) was shown to have a fetal origin. A fetal PCA is classified as either a partial or complete fetal PCA, which can be determined by the presence of a remnant or absence of P1, the PCA segment directly arising from the terminal of the basilar artery. If absent, the PCA has arisen completely from the internal carotid artery (ICA) and is termed complete fetal PCA, or cfPCA. A partial fetal PCA, or pfPCA, is what is found when a hypoplastic segment persists. Here, we report a partial infarction of the oculomotor nucleus with ipsilateral fetal PCA in a 59-year-old female.