Down syndrome | Tourette syndrome | Asperger syndrome | Marfan syndrome | Down Syndrome | Turner syndrome | Down's syndrome | Asperger's syndrome | Williams syndrome | Stockholm syndrome | Severe acute respiratory syndrome | Rett syndrome | Irukandji syndrome | Chronic fatigue syndrome | Wiskott–Aldrich syndrome protein | Tourette Syndrome Association | syndrome | severe acute respiratory syndrome | Premenstrual syndrome | Le syndrome de Peter Pan | Alport syndrome | Usher syndrome | The China Syndrome | Sudden Infant Death Syndrome | Stockholm Syndrome (band) | Stockholm Syndrome | Stickler syndrome | Stevens–Johnson syndrome | Sjögren's syndrome | Restless legs syndrome |
Subphrenic abscess, bowel interposed between diaphragm and liver (Chilaiditi syndrome), and linear atelectasis at the base of the lungs can simulate free air under the diaphragm on a chest X-ray.