Effect of Fetal-type Posterior cerebral artery on cerebral infarction and collateral circulation

Abstract

Abstract We studied 57 patients with cerebral infarction and Fetal-type Posterior cerebral artery (FTP)\, confirmed by MRA and CTA. 26 cases (45.61%) of Complete Fetal-type Posterior cerebral artery (cFTP), 21 cases (36.84%) of Partial Fetal-type Posterior cerebral artery (pFTP), 10 cases (17.54%) of unilateral cFTP.When the ipsilateral internal carotid artery occlusion of cFTP occurs, the bidirectional collateral circulation from the posterior circulation to the posterior communication artery to the anterior circulation cannot be established to compensate, simultaneous infarction of the ipsilateral anterior and posterior circulation can be caused. In the presence of pFTP, since the diameter of P1 was less than that of the posterior communicating artery (PcoA), the collateral circulation of posterior circulation - posterior cerebral artery - middle cerebral artery pia meningeal anastomosis could not be established, anterior circulation infarction was caused by ipsilateral internal carotid artery occlusion. In the presence of bilateral cFTP, the anterior circulation-posterior communication artery-basilar artery could not be established to compensate for the collateral circulation of other branches except bilateral posterior cerebral artery, resulting in bilateral cerebellar and brainstem infarction. FTP changes the cerebral artery circulation and collateral circulation pathways in the normal state.