“That’s not physically possible, to have no idea. It’s not possible,” Stewart said on Monday. “Would you say to the doctor, ‘No, no, no, don’t tell me! I want to find out at my MRI reveal party?’”

Stewart mimicked popping out the confetti.

“Oh, it’s the lymph nodes!” he said in mock celebration.

“For God’s sakes, man, were you not curious at all? When they laid you down in a tube, for a half an hour to 45 minutes, you didn’t want to know what they might be doing?” Stewart asked. “Or did you just think to yourself, ‘What a loud tanning bed.’”

Trump said that while he didn’t know which part of his body was scanned, the result was “perfect.”

Stewart found that just as unlikely.

“So you didn’t even know what they scanned, but you got a perfect score?” he asked. “Because by the way, that’s how they score the MRIs: You either get a big stamp, ‘Perfect,’ or you get, in red ink, ‘See me.’”

Trump also insisted the MRI didn’t examine his brain because he had already “aced” a cognitive test.

“Did you ace it?” Stewart asked. “Or is, perhaps, the cognitive test knowing what part of your body was scanned? Maybe that was the test.”

The White House later said Trump had received cardiovascular and abdominal imaging as a “preventative” measure and that those images were “perfectly normal.”

See more in Stewart’s Monday night monologue: