Examples

• Football sign
  Football sign
  In radiology, the football sign is a sign indicative of air in the abdominal cavity seen on supine radiographs of the abdomen. It appears as a large oval radiolucency reminiscent of an American football. The football sign is most frequently seen in infants with spontaneous or iatrogenic gastric...
  
  
• Hampton's hump
• Omental cake
  Omental cake
  In radiology, omental cake is sign indicative of an abnormally thickened greater omentum. Typically, it is caused by infiltration of metastatic tumours arising from the stomach, ovary and colon. The appearance can also result from tuberculous peritonitis....
  
  
• Pneumatosis intestinalis
  Pneumatosis intestinalis
  In radiology, pneumatosis intestinalis is a sign on x-ray which is highly suggestive for necrotizing enterocolitis.It refers to gas cysts in the bowel wall. This is in contrast to gas in the lumen which is normal.-References:...
  
  
• Rigler's sign
  Rigler's sign
  Rigler's sign, also known as the double wall sign, is seen on an x-ray of the abdomen when air is present on both sides of the intestine; a Rigler's sign is present when air is present on the inside and the outside...
  
  
• Westermark sign
  Westermark sign
  In chest radiography, the Westermark Sign, is a sign that represents a focus of oligemia seen distal to a pulmonary embolus...
  
  
• Golden S sign
  Golden S sign
  In medicine, the Golden S sign is a sign seen on imaging of the chest that suggests a central lung mass or lung collapse. It was first described by Golden in 1925 in association with bronchial carcinoma, but it is also seen in metastatic cancer, enlarged lymph nodes, and collapse of the right upper...
  
  
• Kerley lines
• Peribronchial cuffing
  Peribronchial cuffing
  Peribronchial cuffing, also referred to as peribronchial thickening or bronchial wall thickening is a radiographic sign which occurs when excess fluid or mucus buildup in the small airway passages of the lung causes localized patches of atelectasis...