The spirogram in ankylosing spondylitis. The "reversed emphysema" sign.
D000844:Ankylosis; D004646:Emphysema; D006801:Humans; D011656:Pulmonary Emphysema / Q000175:diagnosis*; D013147:Spirometry; D013166:Spondylitis; D013167:Spondylitis, Ankylosing / Q000175:diagnosis*
PULMONARY EMPHYSEMA/diagnosis; SPIROMETRY; SPONDYLITIS, ANKYLOSING/diagnosis