31.   Doctors initially thought he would be paralyzed from the neck down, but Langevin regained limited use of his arms and hands.

32.   Doctors initially thought the man was suffering from a rapidly growing cancer in the abdomen.

33.   Doctors thought it was mononucleosis.

34.   Doctors thought it was probably a run-of-the-mill viral infection that would go away on its own.

35.   Doctors thought she might have a virus and had her sit out late in the season.

36.   Doctors at first thought she had acute diverticulitis, a disorder of the large intestine, but later diagnosed colon cancer.

37.   Doctors have long thought that postpartum depression is related at least in part to the sharp decline in estrogen that occurs immediately after childbirth.

38.   Doctors initially thought the man was suffering from a rapidly growing cancer.

39.   Doctors now think excess salt can accelerate dehydration, even leading to blood clots, kidney failure, heart attack and strokes.

40.   Doctors think babies become infected with HPV, which invades tissues of the throat and sometimes eyes, as they pass through the birth canal.