# The Missing Vein: A Case of Inferior Vena Cava Agenesis Presenting With Venous Thromboembolism

## TL;DR

A rare case of missing inferior vena cava caused a blood clot in a young man without typical risk factors.

## Contribution

Highlights IVC agenesis as a possible cause of thromboembolism in young patients.

## Key findings

- IVC agenesis can present as deep vein thrombosis in young individuals.
- The condition is often overlooked due to its rarity and lack of traditional risk factors.

## Abstract

Agenesis of the inferior vena cava (IVC) is a rare congenital anomaly that is frequently identified incidentally in patients presenting with venous thromboembolism. The IVC is susceptible to a wide range of congenital anomalies. Due to its rarity and infrequent clinical encounters, it is often overlooked. We describe the case of a young man of African descent who presented with a deep vein thrombosis due to a previously unrecognized diagnosis of IVC agenesis. This case sheds light on IVC agenesis as an alternative diagnosis, especially in younger patients without traditional risk factors for venous thromboembolism.