FIGURE 2 Multimodality image examination. (A) Chest X-ray shows a mass (white star) abutting the left atrium border. (B-C) Cardiac CT reveals a giant aneurysm in the distal of left coronary. (D-I) Cardiac 3D-CT indicated the origin and course of coronary arteries were normal. The left coronary sinus sent out a thick blood vessel branch, connecting a giant left main (LM) coronary artery aneurysm (white star) fistula to the right atrium. AO, aorta; LAD, left anterior descending; LCX, left circumflex; RCA, right coronary artery; LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle.