“…An up-right chest X-ray is the simplest and cheapest diagnostic tool to detect intra-abdominal free air, whereas CT scan of the abdomen is the most sensitive diagnostic test and may be helpful to detect very small amounts of free air if clinically indicated. The type and the duration of operation, the length of the incision, the initial amount of air introduced during surgery, presence of adhesions, drains, and stomas, age, gender and BMI of the patients are among the many proposed contributing factors to the duration of postoperative PP [5, 6, 7, 8, 10, 11]. …”