• 🍒What does the caterpillar sign on abdominal X-ray suggest?

It refers to the appearance of the stomach on an upper gastrointestinal radiographic series or plain abdominal radiograph. On these imaging modalities in a patient with pyloric stenosis, the stomach appears distended, air-filled and with wave-like contours, resembling the appearance of a caterpillar

Caterpillar sign (pyloric stenosis) | Radiology Reference Article | Radiopaedia.org