“…The four subtypes of BTAA (acute dissecting aneurysm, segmental fusiform ectasia, saccular aneurysm, and chronic mural bleeding ectasia) can be distinguished based on imaging symptoms and pathological characteristics (1,3). BTAA is mostly recognized in male patients above the age of 60 years (1,2). The following types of BTAA are common aneurysms (2,4): (1) asymptomatic, usually accidental, or physical examination; (2) sudden headache, nausea, vomiting, and other subarachnoid hemorrhage symptoms; and (3) focal neurological impairments related to aneurysm compression or effects on the brain stem.…”