Occupying lesions may be benign or malignant. Occupying lesions are just a general term for abnormal growth, extension, and inflammatory infiltration of tissues, structures, and organs that occur in a disease, which is a broad concept. Therefore, occupying lesions can be both benign and malignant. 1. Benign lesions: benign space-occupying lesions caused by inflammation, such as lung nodules and tuberculous lesions caused by inflammation in the lungs, and abnormal growth of organs and tissues, such as hemangiomas, hepatic cysts and renal cysts. 2. Malignant lesions: malignant lesions caused by abnormal proliferation of mucous membrane and epithelial cells, such as esophageal cancer, lung cancer, etc.; malignant lesions of lymph nodes and lymphoid tissues of blood system, such as lymphoma; malignant lesions of abnormal proliferation of mesenchymal cells, such as osteosarcoma. Patients who have been diagnosed with space-occupying lesions need to go to specialists for systematic diagnosis and treatment, and if necessary, pathological biopsy should be done to further confirm the benign or malignant nature of the space-occupying lesions.