Double-chambered right ventricle demonstrated by magnetic resonance imaging before cardiac catheterization--case report.

Double-chambered right ventricle is often misdiagnosed clinically and may be missed at cardiac catheterization. The authors encountered a fifty-six-year-old man who had double-chambered right ventricle, which was clearly demonstrated by magnetic resonance imaging (MRI) before cardiac catheterization. The right ventricle was divided into two chambers by hypertrophic muscular bands at the coronal planes. This finding was confirmed by selective angiography, and the pressure gradient in the right ventricle was 98 mmHg. Thus, MRI should be performed in the case of right ventricular obstruction to evaluate the site and extent of obstruction before cardiac catheterization.