A mass found in the rib cage may be a bony mass, such as a chondroma, osteosarcoma, or bone cyst, or a soft tissue mass, such as a sebaceous cyst or lipoma, or an enlarged lymph node. In this case, it is necessary to see a doctor who will make a preliminary determination of the origin of the mass in conjunction with a physical examination. If the mass is considered to be a soft tissue mass, the main task is to improve the local ultrasound examination. If the mass is of bony origin, CT of the lung and 3D reconstruction of the rib cage are needed to accurately determine the size and origin of the mass. For larger masses, a puncture biopsy can usually be considered to determine the nature of the mass. If the mass is benign, surgical excision can be considered for complete cure. If the mass is malignant, it needs to be combined with whether it is a primary mass or a metastatic mass, and depending on the source, the appropriate surgical treatment will be done.