Complete spontaneous thrombosis of a non-giant middle cerebral artery aneurysm: report of two cases

Abstract

Spontaneous intra-aneurysmal thrombosis occurs in approximately 50% of giant intracranial aneurysms. The incidence of this process is associated to location, size, and origin, and the natural history of spontaneous thrombosis occurrence in non-giant aneurysms is rare and still unclear. We describe two non-giant middle cerebral artery (MCA) aneurysms that spontaneously thrombosed and comment the aspects of the literature.

Resumo

Trombose intra-aneurismática espontânea ocorre em aproximadamente 50% dos aneurismas intracranianos gigantes. A incidência é associada a localização, tamanho e origem, e a história natural da ocorrência de trombose espontânea em aneurismas não gigantes é rara e ainda indefinida. Descrevemos dois aneurismas de artéria cerebral média com trombose espontânea e comentamos os aspectos da literatura.

Keywords

Intracranial aneurysm - embolism - intracranial thrombosis - middle cerebral artery

Palavras-chave

Aneurisma intracraniano - embolia - trombose intracraniana - artéria cerebral média

¹Medical Student, Instituto de Cirurgia da Base do Crânio (ICBC), Neurosurgery and Skull Base Surgery, Hospital Ernesto Dornelles, Porto Alegre, RS, Brazil.

²Neurosurgeon, ICBC, Neurosurgery and Skull Base Surgery, Hospital Ernesto Dornelles, Porto Alegre, RS, Brazil.

³Neurosurgeon Emeritus, ICBC, Neurosurgery and Skull Base Surgery, Hospital Ernesto Dornelles, Porto Alegre, RS, Brazil.

⁴Director, ICBC, Neurosurgery and Skull Base Surgery, Hospital Ernesto Dornelles, Porto Alegre, RS, Brazil.