The chest (thoracic) cavity is a space that is enclosed by the spine, ribs and sternum (breast bone) and is separated from the abdomen below by the diaphragm. The chest cavity contains the heart, the thoracic aorta, lungs, and esophagus (swallowing passage) among other important organs. The wall of the chest cavity is made up of the rib cage and diaphragm. The chest wall is firm enough to protect the organs in the chest cavity but flexible enough to move outward and inward with respiration (breathing). As is the case with any other structure in your body, the chest wall can develop tumors.
Non-cancerous tumors of the chest wall are relatively common. There are three main types: Chondroma, Osteochondroma and Fibrous dysplasia
Malignant (cancerous) chest wall tumors
On the other hand, are more rare, and do require treatment. These tumors are almost always sarcomas, which means that they are formed from bone, cartilage, and/or soft tissue of the chest wall. Cancerous chest wall tumors are considered either primary (arising from the chest wall) or secondary (spread from a malignancy originating in another organ).