## **Core Concept**
Double aorta, also known as duplicated aorta, is a rare congenital anomaly where there appears to be two aortic lumens. This condition often results from a developmental anomaly during embryogenesis. Understanding the embryological origin of the aorta and its anomalies is crucial.

## **Why the Correct Answer is Right**
The correct answer, **C. Persistent right dorsal aorta**, is right because during embryonic development, the aorta forms from the fusion of the dorsal aortae. Normally, the left dorsal aorta persists, and the right dorsal aorta regresses. However, in cases where the right dorsal aorta persists along with the left dorsal aorta, it can lead to the formation of a double aorta. This anomaly can be associated with other cardiovascular malformations.

## **Why Each Wrong Option is Incorrect**
- **Option A: Aberrant right subclavian artery** - This is a different kind of vascular anomaly where the right subclavian artery arises directly from the aortic arch instead of the brachiocephalic trunk, which is not directly related to the formation of a double aorta.
- **Option B: Left-sided SVC (Superior Vena Cava)** - This is a congenital anomaly of the superior vena cava, which is a venous structure and not directly related to the development of a double aorta.
- **Option D: Coarctation of the aorta** - This refers to a narrowing of the aorta, typically at the region near the insertion of the ductus arteriosus. While it is a congenital anomaly of the aorta, it does not result in a double lumen.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that double aorta or duplicated aorta is often an incidental finding on imaging studies. However, it's crucial to differentiate it from other aortic anomalies like coarctation or aortic dissection, which have different clinical implications. Awareness of such congenital anomalies is vital for radiologists and clinicians to provide accurate diagnoses and management.

## **Correct Answer:** C. Persistent right dorsal aorta