In the course of clinical examination such as taking CT, X-ray or MRI of both lungs, imaging examinations reveal papillary shadows in the lungs, which are in fact normal in most cases. The papillary shadows found in the lungs are considered to be papillary manifestations of the breast, and if no other abnormalities are found in the lungs, they are normal and do not belong to the disease, and attention is always paid to observe the presence of other lesions in the lungs. In addition, attention should also be paid to the areas where bilateral breast shadows and lung shadows are superimposed, which may result in particularly pronounced papillary shadows, and no special treatment is needed, and the patient should always be reviewed.