Derm Dx: Jaw osteomas and family history of colon cancer

A 28-year-old patient presents complaining of lumps on her jaw that are causing an asymmetric appearance. An x-ray demonstrates that these lumps are actually osteomas.

The patient explains that her father also had jaw osteomas and died of colon cancer at age 43. She has 10 siblings. Seven of the siblings also have jaw osteomas, and the oldest sibling – ...