However, CTA head sensitivity for detecting an aneurysm decreases for both aneurysms <3 mm in size [4,10,13,15,17,19] and aneurysms occurring adjacent to an osseous structure [19]. CTA Neck There is no relevant literature to support the use of CTA neck in the screening of patients at high risk for cerebral aneurysm. CTV Head There is no relevant literature to support the use of CTV head in the screening of patients at high risk for cerebral aneurysm. MRA Head MRA head is an ideal candidate for screening high-risk populations for cerebral aneurysm due to its noninvasive nature and ability to obtain diagnostic information without IV contrast. The evaluation of intracranial aneurysm with MRA head demonstrated a pooled sensitivity of 95% and specificity of 89% in one meta-analysis, in which 45% of the 67 missed aneurysms were <3 mm in size, and another 45% were between 3 and 5 mm in size, 6% were between 5 and 10 mm in size, and 4% >10 mm in size [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 has no relevant literature to support its use in the screening of patients at high risk for cerebral aneurysm. MRA Neck There is no relevant literature to support the use of MRA neck in the screening of patients at high risk for cerebral aneurysm. MRI Head Perfusion There is no relevant literature to support the use of MRI head perfusion in the screening of patients at high risk for cerebral aneurysm. MRI Head There is no relevant literature to support the use of MRI head in the screening of patients at high risk for cerebral aneurysm. MRV Head There is no relevant literature to support the use of MRV head in the screening of patients at high risk for cerebral aneurysm.
Cerebrovascular Diseases Aneurysm Vascular Malformation and Subarachnoid Hemorrhage PCAs. However, CTA head sensitivity for detecting an aneurysm decreases for both aneurysms <3 mm in size [4,10,13,15,17,19] and aneurysms occurring adjacent to an osseous structure [19]. CTA Neck There is no relevant literature to support the use of CTA neck in the screening of patients at high risk for cerebral aneurysm. CTV Head There is no relevant literature to support the use of CTV head in the screening of patients at high risk for cerebral aneurysm. MRA Head MRA head is an ideal candidate for screening high-risk populations for cerebral aneurysm due to its noninvasive nature and ability to obtain diagnostic information without IV contrast. The evaluation of intracranial aneurysm with MRA head demonstrated a pooled sensitivity of 95% and specificity of 89% in one meta-analysis, in which 45% of the 67 missed aneurysms were <3 mm in size, and another 45% were between 3 and 5 mm in size, 6% were between 5 and 10 mm in size, and 4% >10 mm in size [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 has no relevant literature to support its use in the screening of patients at high risk for cerebral aneurysm. MRA Neck There is no relevant literature to support the use of MRA neck in the screening of patients at high risk for cerebral aneurysm. MRI Head Perfusion There is no relevant literature to support the use of MRI head perfusion in the screening of patients at high risk for cerebral aneurysm. MRI Head There is no relevant literature to support the use of MRI head in the screening of patients at high risk for cerebral aneurysm. MRV Head There is no relevant literature to support the use of MRV head in the screening of patients at high risk for cerebral aneurysm.