A 68-year old female patient visited our hospital due to effort angina 1 month ago. She had a history of hypertension and diabetes mellitus, and underwent 2 instances of percutaneous coronary intervention (PCI) at right coronary artery (RCA). A 3.5×32 mm Taxus® (Boston Scientific, Natick, MA, USA) was implanted for proximal RCA 14 years ago, and 3.5×28 mm Cypher® (Cordis, Hialeah, FL, USA) was implanted for significant in-stent restenosis (ISR) in RCA 8 years ago (Fig. 1A, 1B). Twelve-lead electrocardiography showed sinus bradycardia, and the level of cardiac biomarkers were within normal range. Transthoracic echocardiography showed normal left systolic function without wall motional abnormality. So, she was diagnosed with unstable angina pectoris and coronary angiog-raphy (CAG) was done and the CAG showed normal left coronary artery system, but significant type-IC ISR in RCA (Fig. 1C). However, fluoroscopic image and StentBoost® enhanced fluoroscopic image revealed complete transection in previous drug-eluting stents' (DES) overlapped site (Fig. 1D, 1E). After wiring into RCA using Runthrough® wire (Terumo, Tokyo, Japan), we examined intravascular ultrasound for further evaluation, and it confirmed complete stent fracture in DES overlapped site (Fig. 2A). As the patient complained effort angina, and minimal lumen area at the stent fracture site were significant (2.8 mm²), we decided to perform PCI for this lesion. After balloon angioplasty using a 3.5×10 mm non-complaint balloon was used to burst pressure (RAIDEN3®, Kaneka, Tokyo, Japan), a 3.5×15 mm Xience Sierra® (Abbott Vascular, Santa Clara, CA, USA) was implanted at the ISR site. However, follow-up CAG showed stent underexpansion, therefore we performed additional balloon angioplasty using a 3.5×10 mm non-complaint balloon. Final CAG showed good distal flow without significant residual stenosis (Fig. 2B).