When there is a hard bump inside the waist, the first thing to do is to clarify whether there is any trauma. Because trauma can cause a lot of bleeding in the local soft tissues, if it is not treated well at that time, the hematoma will eventually mechanize and thus a hard bump will form. If there is no discomfort, no special treatment can be required and surgical removal can be performed if necessary. If there is no trauma and a hard lump appears inside the waist, it may be a huge lipoma. In most cases, no special treatment is needed, and surgery can be performed if necessary. Pathological examination after surgical excision is the gold standard for differential diagnosis. If, after ultrasound examination, it does not look like a benign neoplastic disease such as lipoma, it is necessary to actively improve the MRI examination and then undergo surgical excision, followed by pathological examination after surgery. In case of malignant tumor disease, radiotherapy and chemotherapy will be administered according to the pathology results.