The difference between cysts and benign tumors lies in the nature, imaging manifestations, clinical manifestations, and biological features. 1. Cyst: refers to a cystic benign mass growing in one of the organs of the body, which may be a physiologic cyst or a pathologic cyst. The presence of fluid of different nature within the cyst can be detected by imaging. Generally, smaller cysts have no obvious symptoms, but when the size gradually increases and causes pressure on the surrounding neighboring organs, then compression symptoms will appear, such as loss of appetite, nausea, vomiting, etc., when the pressure is on the abdomen. In addition, the growth rate of cysts is generally slow, and the prognosis is good. 2. Benign tumors: they are tumors without infiltrative and metastatic ability, which are formed by abnormal differentiation of body cells. The imaging manifestations of benign tumors show clear boundaries, uniform texture, regular morphology, and usually no periosteal reaction. Patients will have lumps on the body surface, which will be painful when the tumor grows, or ulcerated if the growth rate is too fast. Moreover, benign tumors grow expansively and slowly, but the differentiation of tumor cells is mature and there is a low recurrence rate. All in all, patients need to go to the hospital to complete a series of related examinations, and the doctor will determine whether it is a cyst or a benign tumor.