Multimodality Imaging Features and Pathologic Correlation
A 42-year-old woman presented to the emergency department with recurrent episodes of palpitation. The physical examination and the ECG were unremarkable. Echocardiographic examination revealed a solid mass compressing the right cardiac chambers (Movie I in the online-only Data Supplement). A contrast-enhanced computed tomography of the thorax confirmed the presence of a soft tissue mass measuring 8×6×9 cm in transverse × anteroposterior × craniocaudal dimensions, in the right atrioventricular groove (Figure 1). It contained no calcifications, and no vascular connection with adjacent structures was identified. There was no pericardial effusion.
Cardiac magnetic resonance imaging confirmed an intrapericardial mass in the right atrioventricular groove surrounding the right coronary artery. The mass was isointense to myocardium on T1-weighted imaging (Figure 2) and hyperintense on …