Irregularity of the anterior segment of the right 4th rib is an imaging condition of the rib, which can be caused by developmental abnormalities, rib fracture, and neoplastic lesions. 1. Developmental abnormality: some ribs have congenital developmental abnormality, which will lead to irregular bone shape, such as forked ribs. 2. Rib fracture: rib fracture can also lead to irregular bone shape, part of which can be recovered by itself with fracture repair. 3. Tumor lesions: costal chondroma and metastatic tumor can lead to irregular bone shape, and some of them can be accompanied by the formation of surrounding soft tissue mass. If there is irregularity in the bone pattern of the anterior section of the right 4th rib, accompanied by the formation of local mass, it is necessary to go to the hospital in time for medical examination, and after diagnosing the condition, carry out standardized treatment under the guidance of the clinician, so as to avoid delaying the condition.