Unsuperficial myometrium is a description in tumor pathology or imaging, which indicates that the cancer cells have not exceeded the myometrium, and it is a pathological description that usually indicates the infiltration degree of cancer cells, and it is commonly used in various epithelial tumors. For example, if uterine cancer has not exceeded the myometrium, if no myometrial infiltration is seen in imaging examination, it means that the cancer cells are only limited to the focal area and have not accumulated to the myometrium, which is a better examination result, indicating that the cancer cells have not metastasized and spread to the distal end, and the condition can be controlled through timely treatment. In the diagnosis of gastric mucosal tumors, it means that no cancer cells are found in the muscle layer of the gastric mucosa, and the cancer cells may be limited to the gastric mucosa or submucosa.