Why Do Some Surgeons Store Excess Rib Cartilage Left over from Revision in the Scalp Area?

Storing excess harvested cartilage in the scalp behind the ear is done in case any revision (or refinement) procedures are needed in the future. The cartialge can be from any source, really, including the nasal septum. The idea is that it is much more straightforward to retrieve banked cartilage from behind the ear (if needed) than re-entering the nose or chest.

If there is a lot of left over cartilage (more likely with rib cartilage harvesting) I will also replace some of the cartilage back into the chest. Banking too much cartilage behind the ear can cause other problems.

Most surgeons only do this if they think that there is a reasonably good chance that further cartilage may be needed down the road.  The chances of this in your case are difficult to know; however, the scalp offers an area that is easy to access during rhinoplasty, isn't near the lungs (which could expose the patient to risk of a collapsed lung), and offers a good chance for survival of the cartilage (due to the high blood flow in the area).