Double-chambered right ventricle: magnetic resonance imaging findings.

Primary double-chambered right ventricle is an uncommon congenital anomaly that presents with right ventricular outflow tract obstruction in childhood or adolescence. A search of the literature revealed only a few documented case reports with MRI findings. We present a case with mixed lesions, and with anomalous muscle bundles located both in the middle portion of the right ventricular sinus and at the subinfundibular level.