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CASE REPORT
Year : 2020  |  Volume : 15  |  Issue : 4  |  Page : 1055-1058

Spontaneous disappearance of an intracranial small unruptured aneurysm on magnetic resonance angiography: Report of two cases


1 Department of Neurosurgery, Tsukuba Memorial Hospital, Tsukuba, Ibaraki, Japan
2 Department of Radiology, Tsukuba Memorial Hospital, Tsukuba, Ibaraki, Japan
3 Department of Neurosurgery, Institute of Clinical Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan

Correspondence Address:
Dr. Eiichi Ishikawa
Department of Neurosurgery, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575
Japan
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ajns.AJNS_281_20

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Spontaneous radiographic disappearance of cerebral aneurysms is often observed under special conditions such as giant aneurysms. However, spontaneous disappearance of an unruptured and nongiant intracranial saccular aneurysms is rare. We describe two cases of this rare vascular phenomenon. The first patient is a 64-year-old female diagnosed with a small unruptured aneurysm arising from the distal anterior cerebral artery. Spontaneous disappearance of the aneurysm on magnetic resonance angiography (MRA) was observed 5 years after the initial diagnosis. Continuous imaging surveillance also revealed spontaneous reappearance of the aneurysm 2 years later. The second patient is a 57-year-old female harboring a small unruptured saccular aneurysm arising from the M1–M2 bifurcation of the middle cerebral artery. The aneurysm showed spontaneous disappearance on MRA 13 years after the initial diagnosis. These cases provide a new insight into this natural dynamic process even in cases of a small unruptured intracranial saccular aneurysm.


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