Sensitive most investigation to detect minimal intraperitoneal free air
Although as little as 1 ml of free gas can be demonstrated radiographically, either in chest PA or a left lateral decubitus abdominal film, CT is superior to plain radiographs in detecting minute quantities of pneumoperitoneum. Chest PA view is more sensitive than even a left lateral decubitus abdominal film.
Standing x-ray abdomen
Right lateral decubitus x-ray
Chest x-ray
Left lateral decubitus x-ray
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