Former President Jimmy Carter revealed recently that the cancer doctors had found in his liver during an exam in May had spread to his brain. The doctors diagnosed the cancer as melanoma, a skin cancer, but they didn't know the exact source. The doctors removed a malignant tumor along with about a tenth of Carter's liver in early August, according to reports by Tribune Newspapers. Later, scans found the four spots on his brain. They did not find cancer in his pancreas, though pancreatic cancer killed four Carter family members. Carter said he will undergo treatment, though this cancer in late stages has a poor prognosis. He told reporters that he was "at ease" with what comes and wasn't in much pain. Dr. Charles Park, a neurosurgeon at Mercy Medical Center in Baltimore, who has not treated the former president, answers questions about melanoma in the brain.