CTA Neck There is no relevant literature to support the use of CTA neck in the surveillance of a known, untreated cerebral aneurysm. CTV Head There is no relevant literature to support the use of CTV head in the surveillance of a known, untreated cerebral aneurysm. MRA Head MRA head is an ideal candidate for imaging surveillance of known, untreated aneurysms because of its noninvasive nature and ability to obtain diagnostic information without intravenous (IV) contrast. The evaluation of intracranial aneurysm with MRA head demonstrated a pooled sensitivity of 95% and specificity of 89% in one meta-analysis [21]. Diagnostic accuracy is increased, including for aneurysms <5 mm in size, at 3T scanner strength [21,22]. Vessel loops and infundibular origins of vessels can lead to false-positives for aneurysm on MRA [23]. Contrast- enhanced MRA head may increase visualized detail of large aneurysms with complex flow dynamics or thrombosis [45]. However, there is no significant difference in diagnostic performance between time-of-flight MRA and contrast-enhanced MRA on the aforementioned meta-analysis of MRA examinations in the diagnosis of aneurysms [21]. MRA Neck There is no relevant literature to support the use of MRA neck in the surveillance of a known, untreated cerebral aneurysm. CVD-Aneurysm, Vascular Malformation, and SAH MRI Head Perfusion There is no relevant literature to support the use of MRI head perfusion in the surveillance of a known, untreated cerebral aneurysm. MRI Head There is no relevant literature to support the use of MRI head in the surveillance of a known, untreated cerebral aneurysm. MRV Head There is no relevant literature to support the use of MRV head in the surveillance of a known, untreated cerebral aneurysm. US Duplex Doppler Carotid Artery There is no relevant literature to support the use of carotid artery US duplex Doppler in the surveillance of a known, untreated cerebral aneurysm.
Cerebrovascular Diseases Aneurysm Vascular Malformation and Subarachnoid Hemorrhage PCAs. CTA Neck There is no relevant literature to support the use of CTA neck in the surveillance of a known, untreated cerebral aneurysm. CTV Head There is no relevant literature to support the use of CTV head in the surveillance of a known, untreated cerebral aneurysm. MRA Head MRA head is an ideal candidate for imaging surveillance of known, untreated aneurysms because of its noninvasive nature and ability to obtain diagnostic information without intravenous (IV) contrast. The evaluation of intracranial aneurysm with MRA head demonstrated a pooled sensitivity of 95% and specificity of 89% in one meta-analysis [21]. Diagnostic accuracy is increased, including for aneurysms <5 mm in size, at 3T scanner strength [21,22]. Vessel loops and infundibular origins of vessels can lead to false-positives for aneurysm on MRA [23]. Contrast- enhanced MRA head may increase visualized detail of large aneurysms with complex flow dynamics or thrombosis [45]. However, there is no significant difference in diagnostic performance between time-of-flight MRA and contrast-enhanced MRA on the aforementioned meta-analysis of MRA examinations in the diagnosis of aneurysms [21]. MRA Neck There is no relevant literature to support the use of MRA neck in the surveillance of a known, untreated cerebral aneurysm. CVD-Aneurysm, Vascular Malformation, and SAH MRI Head Perfusion There is no relevant literature to support the use of MRI head perfusion in the surveillance of a known, untreated cerebral aneurysm. MRI Head There is no relevant literature to support the use of MRI head in the surveillance of a known, untreated cerebral aneurysm. MRV Head There is no relevant literature to support the use of MRV head in the surveillance of a known, untreated cerebral aneurysm. US Duplex Doppler Carotid Artery There is no relevant literature to support the use of carotid artery US duplex Doppler in the surveillance of a known, untreated cerebral aneurysm.