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from Section 2 - Diagnosis, Assessment, Investigation, Monitoring and Data Interpretation
Published online by Cambridge University Press: 27 July 2023
Key Learning Points
1. On an abdominal X-ray, the bowel is only visible when there is intraluminal gas or an air–fluid level, as the different densities are required to create contrast resolution so they can be perceived on a radiograph.
2. The 3/6/9 rule refers to the maximum size of specific sections of the bowel.
3. On an abdominal X-ray, the small bowel is normally central and valvulae conniventes can be seen. The colon, by contrast, is normally peripheral and has haustral folds which do not completely traverse the lumen.
4. In the early stages of pancreatitis, no abnormalities may be seen on CT imaging.
5. In cholecystitis, ultrasound is more sensitive than CT; however, CT is better at depicting complications such as perforation.
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