Jake 'The Snake' Roberts: I Have Cancer

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JAKE THE SNAKE
Jake 'The Snake' Roberts at the 2013 Chicago Comic and Entertainment Expo in Chicago. Roberts tells TMZ he has cancer and needs emergency surgery. (Photo by Daniel Boczarski/Getty Images) | Daniel Boczarski via Getty Images

Jake "The Snake" Roberts has a cancerous tumor behind his knee ... and the wrestler says it's slowly growing into his muscle -- so he needs emergency surgery to remove the growth.

Roberts tells TMZ ... he noticed a tumor behind his knee the size of a half dollar last month so he had it tested ... and on Friday doctors told him the test came back positive for cancer.

Read the whole story at TMZ