The study revealed that 92% of fetuses had a typical number of ribs, 5.3% had fewer, and 2.7% had more. The first seven sets of ribs are called true ribs. Costal cartilage anchors them to the edge ...

An uneven rib cage means the sides of the rib cage are not symmetrical. There are several causes of uneven ribs, including scoliosis and Poland syndrome. Alternatively, a person born with an ...