Fig. 4. False-negative case. A small aneurysm (arrow) at left paraclinoid internal carotid artery was noted on TOF MRA (A) and MIP image (C). Another small aneurysm (arrow) at the tip of the basilar artery was also noted on TOF MRA (D) and MIP image (F). The model correctly detected the left paraclinoid aneurysm (red box in B). However, the model failed to detect the small aneurysm at the basilar artery (E). The bounding box shown on (E) was for the left paraclinoid aneurysm, which was clearly seen on other slices (B). Since the model failed to detect all of the aneurysms in this examination, this case was considered as false-negative. TOF, time-of-flight; MRA, magnetic resonance angiography; MIP, maximum intensity projection.