Right heart diaphragmatic angle cystic lesion is mostly considered to be pericardial cyst, which is a benign lesion, and the treatment is to improve lifestyle and surgery if necessary. 1. Improvement of lifestyle: most patients have no conscious symptoms, and are found incidentally for a variety of other reasons on examination. If the cyst is not very large and there is no other clinical discomfort, it can be left untreated for the time being. However, it is necessary to pay attention to rest, eat less spicy and stimulating food, and regularly review the cardiac ultrasound. 2. Surgery: If the cyst becomes large and symptoms such as shortness of breath and chest tightness occur at the same time, it is recommended to have surgery as soon as possible to avoid affecting the heart function or secondary infection. After surgery, you should pay attention to diet, rest, maintain a good mood, and regularly review the cardiac ultrasound, and consult a doctor in time when there are uncomfortable symptoms.