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Number of patients showing a positivity of each of the four US signs studied in the pediatric series of Riccabona et al (11).
| US signs | Patients with a positive sign (#) |
| Abnormal aspect of small intestine | 36 |
| Increased peristalsis | 32 |
| Abdominal fluid | 30 |
| Pericardial effusion | 18 |
