Fig. 8
From: Aortic emergencies—diagnosis and treatment: a pictorial review
Signs of impending rupture. Focal “blebbing” (arrow) of the aortic wall (a, c). “Crescent sign” with hyperdense thrombus (b). Draped aorta signs (b, e) with flattening of the posterior aspect of the abdominal aorta. Focal “discontinuation” of the aortic contour (here with discontinuation of the wall calcification and blebbing) (c) in a 6-cm abdominal aortic aneurysm. The patient refused further treatment. He presented with hypotension 3 months later. CTA demonstrated a ruptured aneurysm (d)