Abstract

The circle of Willis is considered an important collateral pathway in maintaining adequate cerebral blood flow in patients with internal carotid artery obstruction. The degree of contribution of the vertebro-basilar and carotid systems having vital role in brain perfusion. Aim of this case study was report vary rare variations in brain circulation from the normal anatomy. Such variation is important to diagnostically as well as therapeutically for neurosurgeons. These variations we got during routine dissections of body for undergraduate students at institute of medical sciences, Banaras Hindu university Varanasi, Uttar Pradesh. variations are i) Bilaterally there is absence of posterior communicating artery. i) Variations of anterior cerebral artery. These anomalies may alter the occurrence, severity of symptoms, treatment options and recovery from certain cerebrovascular disorders viz., stroke and aneurysms. A thorough knowledge of the vascular variants useful to surgeons in planning their shunt operations, choice of the patients and also keeps away inadvertent vascular traumas during surgeries.

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