255-Million-Year-Old Tumor Discovered in Ancient Mammal Relative | Video

The fossilized jawbone of a gorgonopsid, a distant and ancient modern mammal relative, contains a 255-million-year-old tumor. The benign tumor, called a compound odontoma, is made up of tiny tooth-like structures and is the oldest of its kind on record. 
credit : Megan Whitney | Christian Sidor | University of Washington