Ovarian foramen magnum occlusion occlusion surgery will have sequelae, including blocker dislodgement, atrioventricular valve regurgitation, cerebral embolism and so on. 1. Dislodgement of the blocker: the main function of the blocker is to block the defective part of the heart. Some patients may have inaccurate estimation of the defective part of the heart or inappropriate selection of the blocker, which may result in the dislodgement of the blocker. 2. Atrioventricular regurgitation: the blocker is mainly stuck in the defective part of the heart, and some patients’ blockers may affect the closure of the valves, leading to atrioventricular regurgitation, which may even induce the occurrence of heart failure. 3. Cerebral embolism: small blood clots may form on the occluder, and cerebral embolism may occur after the blood clots are dislodged. In the process of oval-shaped foramen occludens occlusion treatment, it is important to do a good preoperative assessment and surgical operation to minimize the occurrence of sequelae.