Anterior cerebral artery – Anatomic region favoring aneurysms: Case series.

Aneurysms or Dilatations in the vessels which are prone to rupture occur at bifurcations of large arteries at the base of brain. Rupture occurs into the sub-arachonoid space in the basal cisterns and into parenchyma of the brain. 80-90% of these aneurysms occur at circle of Willis. Commonest types are the Berry’s aneurysms and commonest sites are at junction of anterior communicating artery with anterior cerebral artery and bifurcation of middle cerebral artery.

Surgical significance of variations in anatomy in the biliary region.

Variations in the anatomy of the gallbladder, the bile ducts, and the arteries that supply them and the liver are important to the surgeon, because failure to recognize them can cause iatrogenic injury to the biliary tract. A surgeon should be always be careful while operating in this area. In addition these anomalies are associated with a range of other congenital anomalies, including biliary atresia and cardiovascular or other gastrointestinal malformations, biliary lithiasis, choledochal cyst, anomalous pancreaticobiliary junction etc, so a look out for other anomalies should be carried out simultaneously.