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21 mar 2022 · Free air on CT or Pneumoperitoneum often indicates a life threatening perforation of bowel. There are many causes but a few of the most common are stomach ulcers and diverticulitis. Others can be from medical procedures like colonoscopy where the bowel wall is perforated.
5 kwi 2024 · The most common cause of pneumoperitoneum is the disruption of the wall of a hollow viscus. In children, the causes are different from the adult population and are considered in the neonatal pneumoperitoneum article.
Free gas, or pneumoperitoneum, is gas or air trapped within the peritoneal cavity, but outside the lumen of the bowel. Pneumoperitoneum can be due to bowel perforation, or due to insufflation of gas (CO2 or air) during laparoscopy. Both these causes have identical X-ray appearances, but very different clinical significance.
As differential diagnoses, a 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.
8 kwi 2011 · Detection of intraperitoneal free air is important for the diagnosing of life-threatening conditions in patients with acute abdominal pain. Point-of-care ultrasound is an extension of the clinical examination in patients presenting with acute abdomen.
Sub-diaphragmatic air is usually easy to identify on an erect chest radiograph (CXR) and appears as a dark crescent of gas under each hemidiaphragm, provided the patient has remained erect long enough for free air to rise, and there is a sufficient volume of air to allow identification (fig 1A ⇓).
8 lis 2022 · Urachus Sign: In the supine abdominal radiograph, the free air of pneumoperitoneum outlines the median umbilical ligament and appears as a urachus sign. The median umbilical ligament is formed by the obliteration of urachus (remnants of the canal drain urine in the fetus).
