We describe the case of a woman with acute coronary syndrome who was treated by percutaneous coronary intervention (PCI) and stenting of the proximal right coronary artery, which shared its short origin with the left anterior descending artery. A multi-slice computed tomography study of the patient's coronary tree, performed after percutaneous treatment, played a fundamental role in obtaining a clearer view of the coronary anatomy, as well as of stent positioning in this particular anatomy, eliminating any doubt about the PCI result.