Sonography of Pediatric Small-Bowel Intussusception: Differentiating Surgical from Nonsurgical Cases

Abstract

OBJECTIVE. The purpose of this study was to determine whether there are clinical or sonographic findings that can be used to differentiate benign self-limited small-bowel intussusception from pathologic small-bowel intussusception that necessitates surgical intervention. MATERIALS AND METHODS. A retrospective search was performed of abdominal sonograms obtained at two institutions between January 1996 and June 2005. Sonographic findings were correlated with medical and surgical records. RESULTS. A total of 35 cases of isolated small-bowel intussusception were found. Thirteen (37%) of these cases necessitated surgical intervention, and 22 (63%) of the cases were benign and self-limiting. Patients with self-limiting intussusception were younger than patients with intussusception necessitating surgical intervention (mean, 4.2 vs 7.5 years; p = 0.0327). Abdominal sonograms depicted ascites and small-bowel obstruction significantly more frequently in patients with small-bowel intussusception necessitating surgery (n = 7 [54%] for each finding) than in patients with self-limiting intussusception (n =2 [9%], n =0) (p = 0.006 and p = 0.0003, respectively). At sonography, patients who later underwent surgical intervention had small-bowel intussusception of significantly greater length (mean, 7.3 cm) than those treated conservatively (mean length, 1.9 cm) (p < 0.0001). Intussusception length greater than 3.5 cm was considered a sensitive and specific independent predictor of the need for surgery (sensitivity, 93%; specificity, 100%). CONCLUSION. When small-bowel intussusception is detected in infants and children undergoing abdominal sonography, intussusception length greater than 3.5 cm is a strong independent predictor of the need for surgical intervention.