**Core Concept**
Double inferior vena cava (IVC) is a congenital anomaly characterized by the presence of two IVCs, which is a result of incomplete fusion of the embryonic left and right vitelline veins during fetal development. This anomaly is often associated with other congenital defects, such as situs inversus and asplenia.

**Why the Correct Answer is Right**
The correct answer is related to the embryological development of the IVC. The left and right vitelline veins, which are the precursors to the IVC, normally fuse to form a single IVC during embryonic development. However, in cases of double IVC, this fusion is incomplete, resulting in two separate IVCs. This anomaly can be associated with other congenital defects due to the disruption of normal embryonic development.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, but it could potentially be related to other causes of IVC anomalies, such as thrombosis or trauma.

**Option B:** This option is also not provided, but it could potentially be related to other causes of IVC anomalies, such as compression or obstruction.

**Option C:** This option is not provided, but it could potentially be related to other causes of IVC anomalies, such as iatrogenic injury during surgical procedures.

**Clinical Pearl / High-Yield Fact**
Double IVC is a rare congenital anomaly that can be associated with other congenital defects, such as situs inversus and asplenia. It is essential to recognize this anomaly during radiological imaging to avoid misdiagnosis and ensure proper patient management.

**Correct Answer: D. Incomplete fusion of the embryonic left and right vitelline veins during fetal development.**