House discovers a benign tumor in her heart, which is surgically removed, but it does not account for the hallucinations. House deduces that there must be a clot which the cancer deployed prior to removal. He suggests employing therapeutic hypothermia to discover the clot, which does not show on an angiography: Cooling her body temperature down to 21° Celsius will stop her heart, effectively making her clinically dead. Then the doctors will remove 2-3 liters of blood and discover the clot when the blood is pumped back in. House compares this procedure to "performing an autopsy on a living person."