Fig. 2

Blunt cerebrovascular pseudoaneurysm (grade III lesions according to the Biffl classification). a, b A 57-year-old man who had suffered a car accident. The axial MPR image (a) (4-mm thickness) shows an eccentric dilatation of the right common carotid artery (arrow) with the typical “snowman” appearance; the pseudoaneurysm (arrow) is better depicted on the coronal MIP reconstruction (b) (10 mm thickness). A grade IV lesion of the left common carotid artery was also present. No clinical-radiological risk factors for BCVI were present. The patient underwent anti-aggregation and no neurological deficit occurred. c, d A 19-year-old man who had suffered a car accident. The sagittal MPR image (c) shows a tortuous course (arrowheads) of the right internal carotid artery; the presence of two pseudoaneurysms (arrowheads) is better depicted on the curved MPR image (d) (3-mm thickness). Skull base fractures and a grade IV lesion of the left common carotid artery were present. The patient underwent anti-aggregation but neurological deficit related to a left anterior circle ischaemia was already present at the time of MDCT