Post-carotid endarterectomy hyperperfusion syndrome-is it predictable by lack of cerebral reserve?

Background: Cerebral hyperperfusion syndrome (HS) is presumed to be because of an increase in postendarterectomy flow in patients with fixed cerebral vascular reserve. Severe headache is thought to be an early sign of possible HS. An increase in partial pressure CO₂ (pCO₂) is known to cause cerebral vasodilatation and is used to evaluate the presence of cerebral reserve.

Portal venous aneurysms--report of 4 cases.

Portal venous aneurysms are rare and are usually discovered as incidental findings on abdominal imaging studies. Although most are asymptomatic, they may occasionally cause symptoms of compression of an adjacent structure, thrombosis, or bleeding. Treatment is usually not necessary and conservative follow-up is suggested.