CNN CNN Newsroom With Carol Costello August 20, 2015 14:45:00
Optimism that he will do well with this treatment. >> well, doctor, something else i found difficult to understand, so they found a spot on his liver, right, and now they found melanoma in his brain. so, you know, the liver and the brain are far apart. how does that happen? >> well, let's also understand that melanoma is a skin cancer, and usually we can see a lesion on the skin that's a primary lesion. as the president pointed out, there was no visible lesion that suggested where this cancer actually started. but when melanoma becomes invasive, it can spread, and what makes it so serious as a...
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