Gurpreet Dhaliwal sat onstage in a hotel ballroom in Minneapolis. The gray curtains behind him were illuminated by bright blue lights, giving the slightest hint of performance at an otherwise typical medical conference. The presentation was among the most anticipated at the Society to Improve Diagnosis in Medicine’s 2022 meeting. The attendees were there to watch a kind of showcase: a complex diagnosis in action. Dhaliwal, a professor of medicine at UC San Francisco, was given the details of a