Differential diagnosis of diffuse abdominal pain
| NO | Diagnosis | Sonographic signs |
| Common | ||
| Gastroenteritis | Accentuated bowel walls, increased intraintestinal fluid, possible small hypoechoic mesenteric lymph nodes | |
| Coprostasis | Distended colon loops with tense, air-filled haustra | |
| Mechanical ileus | Bidirectional peristalsis, dilated bowel loops containing increased amounts of fluid | |
| Paralytic ileus | Absence of peristalsis, dilated bowel loops | |
| Peritonitis | Thickened peritoneum, dilated bowel without wall swelling, free fluid | |
| Less common | ||
| Mesenteric vascular | Long segmental thickening of bowel walls, acute luminal narrowing, decreased peristalsis | |
| Dissecting aortic aneurysm | Aortic dilatation, floating anechoic band in aortic lumen, double lumen | |
| Rare | ||
| Intra-abdominal bleeding | Essentially anechoic fluid surrounding the organs; capsular discontinuity is seen with an organ rupture | |
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