de Lacey G, Bloomberg T, Wignall B K
Clin Radiol. 1977 Jul;28(4):445-8. doi: 10.1016/s0009-9260(77)80161-x.
Both sides of the gut wall seen on a plain film of the abdomen is regarded as evidence of free air in the peritoneal cavity. However, this appearance may be precisely simulated when two loops of distended intestine lie in contact with each other. In vitro studies and clinical examples emphasise the necessity of exercising caution when making the diagnosis of pneumoperitoneum on this sign alone.
腹部平片上所见的肠壁两侧被视为腹腔内游离气体的证据。然而，当两个扩张的肠袢相互接触时，可能会精确模拟出这种表现。体外研究和临床实例强调了仅根据这一征象诊断气腹时需谨慎的必要性。
