Figure 4: Multidetector 256 slice computed tomography three-dimensional reconstructed contrast aortogram showing dissection of aorta up to the right external iliac artery. Intimal flap has divided aorta into true lumen (white arrow) and false lumen (yellow arrow). True lumen is smaller in size as compared to false lumen (approximately 30:70). True lumen shows more contrast density and multifocal wall calcifications. False lumen is less dense owing to delayed contrast enhancement.