# Hemodynamics of a right ventricular outflow tract aneurysm assessed with 4D flow MRI before and after unilateral pulmonary artery balloon angioplasty: A case report

## TL;DR

This case report examines blood flow patterns in a rare heart condition using MRI before and after a procedure to widen a pulmonary artery.

## Contribution

The study provides novel hemodynamic insights into a right ventricular outflow tract aneurysm using 4D flow MRI before and after treatment.

## Key findings

- Vortex flow was observed in the aneurysm using 4D flow MRI.
- Vortex flow persisted even after unilateral pulmonary artery balloon dilation.
- Hemodynamic evaluation is crucial for prognosis and treatment planning in such cases.

## Abstract

Right ventricular outflow tract aneurysms are rare postoperative complications associated with congenital heart diseases. The hemodynamics associated with a right ventricular outflow tract aneurysm serve as important risk indicators for aneurysm expansion and thrombus formation; however, they have not been thoroughly evaluated. A 3-year-old girl was diagnosed with Double-outlet right ventricle who underwent surgical correction with patch enlargement of the right ventricular outflow tract at 2.5 years. Postoperatively, a patch expansion mass was observed and 4D flow MRI showed vortex flow. Notably, vortex flow within the aneurysm persisted even after balloon dilation of the unilateral pulmonary artery. Evaluating blood flow in right ventricular outflow tract aneurysms is crucial for determining prognosis and guiding treatment strategies.