BOOP is bronchiolitis obliterans organizing pneumonia. It means a pneumonitis with no known (or found) infection, but that
keeps coming back, sort of hiding out in your lungs until it gets a chance to strike again. They sent my biopsy to Mayo Clinic, and the report they got back suggested the it was probably BOOP, caused by a medicine I was taking for pain. It is a rare response a very few people have had to Vicodon or Neurontin. That's one of several kinds of BOOP.