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A 75‐year‐old man implanted with a sirolimus‐eluting stent from the ostium to the mid‐portion of the right coronary artery (RCA) was admitted to our hospital after a prolonged episode of chest pain. The ECG at chest pain, showing ST depression in leads II, III, aVF, suggested angina pectoris. Coronary angiography showed in‐stent restenosis at the ostial lesion of the RCA (panel A) and obscurity of the stent strut (panel B). A 16‐slice multidetector CT scan was performed after injection of 100 ml of non‐iodinated contrast. The scan showed the strut fracture of the sirolimus‐eluting stent at the ostium of the right coronary artery and protrusion of the fractured stent into the right sinus of Valsalva (panel C).