Pediatric surgery: Intussusception—operative management and viability assessment

A 4-month-old male infant presents with a 3-week history of intermittent abdominal distension and failure to thrive. On examination, a palpable mass is noted in the right upper quadrant. Abdominal ultrasound reveals a target sign with surrounding echogenic mesentery. The infant is scheduled for surgery. Which of the following intraoperative findings would indicate the need for bowel resection rather than simple reduction?