Fig. (16).

Vasculitis is big mimicker of dissection. On the other hand, vasculitis the one of causes of dissection. In a patient with Behcet’s disease, there is brain stem infarction (A) and intimal flap type dissection of arcus aorta (B) and bilateral CCAs (C, D) on CTA. All lumens in dissected arcus aorta is filling (B). Both two lumens in the right CCA is filling while filling lumen (true lumen) is very thin and other (false lumen) is is thrombosed in the left CCA (C, D). In another patient with osteogenesis imperfecta type 1, there is infarction within the left ACA territory (E) with focal narrowing and dialation (string and pearl sign) of left A2 on the volume rendering CTA (F), consisting with dissection of proximal part of left A2. In another patient with Behcet’s disease, vessel wall irregularities with saccular dilatations (pseudoaneurysms) are seen along the both ICAs and right VA (H). Pseudoaneurysm of the celiac trunk is seen in the same patient (I).