Spontaneous total thrombosis of distal superior cerebellar artery aneurysm

We report the case of an aneurysm of the distal segment of the superior cer ebellar artery (SCA) which showed complete spontaneous thrombosis. Initial angiography performed in another institution showed 3 non-ruptured aneurysm s located on the right distal SCA, C3 segment of the right internal carotid artery (ICA) and left basilar artery (BA) - SCA bifurcation. The patient h ad two episodes of transient cerebellar ataxia of the right hand before adm ission to our hospital, but no neurological signs were noted on admission. Computed tomography (CT) and magnetic resonance image (MRI) showed a thromb osed mass on the right cerebellar peduncle, and angiography showed no filli ng of the right SCA from its origin. A follow up angiogram 9 month after en dovascular surgery for other aneurysms showed no recanalization of SCA or t he aneurysms. There are no previous reports of total spontaneously thrombos ed non-giant aneurysms of the distal segment of the SCA.