When it comes to retroperitoneal tumor, I believe it is a rather unfamiliar concept to most people because we seldom encounter such patients around us in our daily life, and scientifically speaking, the incidence of retroperitoneal tumor is indeed very low, with about 10,000 new cases per year. But even this incidence rate should not be ignored. Because for these patients, their disease is often severe and it is difficult to find excellent local medical platform and team to solve their pain. So what kind of disease is it? Retroperitoneal tumors include primary retroperitoneal tumors that originate in the underlying retroperitoneal space and secondary retroperitoneal tumors that metastasize from other sites, but clinically, we often refer to primary retroperitoneal tumors only. In terms of pathological types, liposarcoma is the most common, followed by smooth muscle sarcoma, and some other more common tumor types include pleomorphic undifferentiated sarcoma, paraganglioma, and malignant mesothelioma. After talking about so many professional things, you may still have no idea, so let’s talk about the most typical manifestation of retroperitoneal tumor, that is, the tumor is usually very large, which is what we usually call “big tumor”. Patients usually find that their abdomen or pelvis swells rapidly within a short period of time, and they can often feel the huge tumor themselves, so when you encounter such a situation, you should be alerted that it may be more than just a simple thing like gaining weight recently. Of course, if the diagnosis of retroperitoneal tumor is confirmed, there is no need to be overly anxious, as early surgery is very necessary. So, what kind of hospital should be chosen? Since the surgery of retroperitoneal tumor is extremely risky and difficult, it puts forward higher academic and technical requirements for the formulation and implementation of related treatment decisions, and also puts forward higher requirements for related medical institutions in terms of clinical and scientific research such as expert team, instruments and equipment, treatment mode, etc. Therefore, in order to ensure medical quality and safety, patients are recommended to go to experienced large treatment centers.