In general, duodenal soft tissue density shadows are considered as possible diseases such as duodenal inflammation, duodenal polyps and duodenal malignancy. Soft tissue density shadow is a professional description that appears in X-ray, CT and other imaging examinations, in the X-ray, CT and other imaging examinations, soft tissues generally do not appear, only when there is inflammation, edema, mass around the soft tissues, soft tissue density shadow may appear in the imaging. Therefore, the appearance of soft tissue density shadow in the duodenum may mean that there is an inflammatory reaction around it, or it may be an imaging description of the occurrence of masses or tumors in the tissues and organs of the organism. Examples include duodenal inflammation, duodenal ulcers, duodenal polyps and other benign and malignant tumors. Duodenal soft tissue density shadow is recommended to seek prompt medical attention in order to clarify the diagnosis, under the guidance of the doctor for targeted treatment.