Occupancy is a term commonly used in clinical work and is referred to in full as an occupying lesion. This refers to a lesion that has structural abnormalities within or around normal tissues and organs and causes compression and invasion of normal tissues. The benign occupying lesions can be classified as benign or malignant depending on the nature of the lesion, and the common benign occupying lesions are liver cysts, hemangiomas, adenomas, etc. Malignant occupying lesions mostly refer to cancer and sarcoma, such as liver cancer, lung cancer, ovarian cancer, mesenchymal tumor and so on. Once a patient is diagnosed with an occupying lesion, the nature of the lesion can be evaluated with imaging and treated as soon as possible if the lesion is malignant.