Mimicking aneurysm in a patient with chronic occlusion of the left middle cerebral artery: A case report.

ABSTRACT

BACKGROUND: With the popularization of various cerebrovascular imaging methods and increased attention to the field, more cerebrovascular diseases are being detected in asymptomatic patients. Different cerebrovascular diseases are typically isolated but occasionally occur simultaneously, causing difficulties in diagnosis and treatment. Morphological changes in the collateral circulation of blood vessels in chronic cerebral artery occlusion patients are slow and dynamic, intercepting morphological development at a specific moment. Excessive reliance on single imaging tests such as digital subtraction cerebral angiography (DSA) can lead to misdiagnosis. CASE SUMMARY: We report a 52-year-old male who was admitted to our department for treatment of an unruptured aneurysm during a follow-up examination for brain trauma after 1 mo. Computed tomography (CT) scan was negative, but CT angiography (CTA) revealed a sac-like bulge at the bifurcation of the left middle cerebral artery. DSA revealed an unruptured aneurysm with unique scapular morphology. The stump of a middle cerebral artery occlusion was observed during exposure during aneurysm clipping surgery, and the diagnosis of chronic cerebral artery occlusion was confirmed intraoperatively. This case was confusing because of the peculiar morphology of the arterial stump and compensatory angiogenesis due to multiple cerebral artery stenoses observed on preoperative CTA and DSA. The surgery did not cause secondary damage to the patient, and medical treatment for risk factors was continued postoperatively. CONCLUSION: Multiple cerebral arterial stenoses can occur in conjunction with aneurysms or arteriovenous malformations, and their unique morphology can lead to misdiagnosis.