Pneumoperitoneum is a term describing intraperitoneal, extraluminal air. Although it can be seen in either benign or serious condition, most represent lethal situation. Prompt diagnosis and prompt treatment are keys to save patients’ lives. Plain radiograph is the first-lined imaging modality for diagnosis of pneumoperitoneum. Small amount of free air can be easily seen beneath diaphragmatic domes on upright film. Unfortunately, sick patients could undergo only supine films which need more attention during interpretation. Physicians should be familiar with signs of pneumoperitoneum on supine abdominal radiograph and able to interpret this critical condition accurately.
[Thai J Gastroenterol 2005; 6(3): 173-177]