We report an unusual complication of cutting balloon (CB) angioplasty during treatment of aorto-ostial in-stent restenosis. The stent strut was entangled with CB and the stent was extracted partially into the aorta during CB catheter withdrawal, followed by stent and CB catheter fracture. The patient underwent emergency operation for coronary revascularization and device removal. It is important to monitor the stent and CB markers during CB withdrawal, especially when resistance is felt. When strut avulsion occurs with intact CB retrieval, the complication is still salvageable with gentle advancement of the balloon. Another possibly effective way to release the blade from the stent strunt is reinflating and deflating the balloon with a slight back-and-forth vibration. However, when balloon fracture occurs, emergent surgical removal is the best solution.