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A 42-year-old-woman presented with de novo crescendo angina. Thallium-scintigraphy showed inferior ischemia. Coronary angiogram revealed a right coronary artery (RCA), originating from the left sinus of Valsalva with a severe proximal systolic compression. She underwent successful transradial percutaneous coronary intervention with stent implantation. Multislice-computed tomography (MSCT) is usually used to evaluate coronary artery anomalies and can effectively show the anomalous RCA and the inter-arterial trajectory between the aorta and pulmonary arteries. Anomalies of the origin of the coronary arteries are rare, but can produce specific clinicopathological entities that should be diagnosed with accuracy. This case report illustrates the role of MSCT in the detailed description of an abnormal coronary artery and the use of stenting for symptoms relief.