CT Scan for Hernia Assessment: With or Without Contrast?

Diagnostic Approach for Hernias

For suspected diaphragmatic hernia with respiratory symptoms, a chest X-ray is recommended as the first diagnostic study, according to the World Journal of Emergency Surgery guidelines 1
When clinical suspicion persists despite normal or equivocal chest X-ray findings, CT scan should be performed to confirm or refute the diagnosis, with a sensitivity and specificity of 14-82% and 87%, respectively 2
CT scan with IV contrast enhancement is the gold standard for diagnosing diaphragmatic hernias, providing superior visualization of diaphragmatic discontinuity, herniated abdominal contents, and potential complications such as ischemia 2, 1

CT with IV contrast provides superior visualization of herniated abdominal contents and their vascular status, including the "collar sign" and potential complications such as ischemia, which appears as absence of gastric wall contrast enhancement, intestinal wall thickening, and other vascular abnormalities 2, 1
The American College of Radiology recommends CT with IV contrast to assess nodular wall thickening and soft tissue attenuation that may indicate complications, with Level 1B evidence supporting its use in stable trauma patients 3, 2

In stable trauma patients with suspected diaphragmatic hernia, CT scan with contrast enhancement of the chest and abdomen is strongly recommended, with Level 1B evidence, according to the World Journal of Emergency Surgery guidelines 2, 1
In pregnant patients with suspected non-traumatic diaphragmatic hernia, ultrasonography is suggested as the first diagnostic study, followed by MRI if needed, while CT should be avoided due to radiation exposure, as recommended by the Journal of the American College of Radiology 2, 5