Correct Answer » A Explanation

During sudden deceleration injuries (such as car crashes or falls from height), the mobile parts of the aorta move suddenly while fixed parts remain stationary. This difference in movement causes tearing at fixed points.

Common sites of traumatic aortic rupture

1. Aortic isthmus (near ligamentum arteriosum) – Most common site

2. Where the aorta passes through the diaphragm

3. Posterior mediastinum (descending thoracic aorta behind the esophagus)

These areas are relatively fixed, making them prone to rupture.

Explanation of Other Options:

B. Behind the esophagus
The descending thoracic aorta lies behind the esophagus and is relatively fixed.
This region can rupture in deceleration injuries.

C. Where it pierces the crura of diaphragm
The aortic hiatus (T12) fixes the aorta to the diaphragm.
This is a recognized site of traumatic rupture.

D. At ligamentum arteriosum
This is the most common site of traumatic aortic rupture (aortic isthmus).
It is tethered by the ligamentum arteriosum.