An ancient surgeon in Peru probably used a sharp tool to carefully groove the perfect circles in this Incan skull. Healed bone around the edge of the holes indicates the patient was alive during the surgery and probably survived. Scholars can't explain the purpose behind the mysterious multiple openings.
The deep, straight cuts in this Peruvian skull were made by rocking a blade back and forth. Their varying placement suggests the surgery was poorly executed and unsuccessful.
The half-circle broken out of this Peruvian skull was possibly caused by a slingshot stone. A triangular surgical hole extends from the fracture.
A surgical hole in this skull was started and then stopped. The linear criss-cross cuts are unfinished, perhaps because the patient, a Peruvian child, didn't live long enough for the surgery to be completed. A smashed and broken section of injured bone is visible inside the attempted opening.