Dealing with Partial Intestinal Obstruction

A two-year-old child presented with symptoms of abdominal pain for four hours and vomiting once, had been given 654-2 but showed no improvement and was admitted to the hospital. Physical examination revealed the main symptom to be periumbilical pain, with other test results negative. X-rays showed intestinal distension, and ultrasound examination was negative. How do experts diagnose this condition?
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