Pericallosal Artery Aneurysm Mimicking a Falx Meningioma

Park, Sang-Jin; Park, Seong-Hyun; Hwang, Jeong-Hyun; Hwang, Sung-Kyoo

Case report

Journal of the Korean Society of Stereotactic and Functional Neurosurgery 2016;12(1):11-13.
Published online June 30, 2016.

Pericallosal Artery Aneurysm Mimicking a Falx Meningioma

Sang-Jin Park, Seong-Hyun Park, Jeong-Hyun Hwang, Sung-Kyoo Hwang

Department of Neurosurgery, Kyungpook National University Hospital, Daegu, Korea

Abstract

We report a case of a pericallosal artery aneurysm mimicking a falx meningioma. A 54-year-old woman was admitted to a local clinic for regular checkup. A brain computed tomography on admission showed a focal nodular high intensity lesion in the anterior interhemispheric fissure. Brain magnetic resonance imaging revealed strong contrast enhancement after gadolinium injection. Location and radiological appearance of the lesion resembled that of a falx meningioma, except for the finding of signal void and vascular connection to the distal anterior cerebral artery. After cerebral angiography, the nodular lesion was diagnosed as an aneurysm arising from the pericallosal artery. The patient was successfully treated via surgical clipping. We should consider the possibility of a pericallosal artery aneurysm when an enhancing nodular lesion is located in the anterior interhemispheric fissure, adjacent to the distal anterior cerebral artery.

Key Words: Aneurysm, Falx cerebri, Interhemispheric fissure, Meningioma, Pericallosal artery.