Anomalies of Basal Cerebral Arteries

The persistence of the embryonic origin of the posterior cerebral artery from the carotid artery is a common incidental autopsy finding (Fig. 4.35). Subsequently, the supply territory of the posterior cerebral artery becomes liable to circulatory insufficiency in the carotid artery.

In hypoplasia of one vertebral artery, the basilar artery is the continuation of the normal vertebral artery.

FIGURE 4.34

Dolichoectasia in an 83-year-old man. A. The basilar artery is tortuous, its wall is thin and soft, and the lumen distended. The artery is the continuation of the thin-walled right vertebral artery. B. The wall of the basilar artery is fibrotic, the elastic lamina is fragmented and partially missing (Verhoeff elastic stain).

FIGURE 4.34

Dolichoectasia in an 83-year-old man. A. The basilar artery is tortuous, its wall is thin and soft, and the lumen distended. The artery is the continuation of the thin-walled right vertebral artery. B. The wall of the basilar artery is fibrotic, the elastic lamina is fragmented and partially missing (Verhoeff elastic stain).

Basilar Dolichoectasia Neuropathology

FIGURE 4.35

Anomalous origin of the PCAs from the respective carotid arteries.

FIGURE 4.35

Anomalous origin of the PCAs from the respective carotid arteries.

Subsequently, the supply territory of the hypoplastic artery becomes vulnerable to falls in systemic blood pressure.

The persistence of the trigeminal artery between the cavernous section of the carotid artery and the basilar artery has been associated with trigeminal neuralgia.

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