Mesenteric Base Width: Abdominal Wall Diameter Correlates With Intestinal Rotational Anomalies in Infants.

INTRODUCTION

Symptomatic malrotation requires urgent Ladd procedure. Patients with incidental or indeterminate findings have historically been managed with observation or operatively. Fluoroscopic identification of the duodenojejunal junction (DJJ) and ileocecal junction (ICJ) can guide operative decision-making, but algorithms have not been validated. This study aimed to determine whether fluoroscopic mesenteric base width (MBW) standardized to abdominal wall diameter (AWD) correlates with intraoperative anatomy in infants.

METHODS

We retrospectively reviewed patients between 2013 and 2023 who were <1 year with fluoroscopy identifying DJJ and ICJ. Infants with normal rotation evaluated for digestive concerns were included. Congenital conditions with intestinal nonrotation were excluded. Two radiologists independently measured MBW as a diagonal line from DJJ to ICJ and maximal transverse AWD from inferior ribs. A ratio was calculated and compared between groups. Wilcoxon rank-sum and Kruskal-Wallis tests with p < 0.05 were considered significant. Area under the receiver operating characteristic curve (AUROC) was used to identify optimal ratio cutoff.

RESULTS

Fifty-eight patients, 22 normally rotated and 36 with intestinal rotational abnormality (IRA), met inclusion criteria. Preoperative radiographic concern for malrotation differed between groups (p < 0.0001). Median MBW:AWD was significantly lower in IRA than normal rotation based on imaging (0.31 vs 0.65, p < 0.0001). Optimal MBW:AWD of 0.55 had an AUROC of 0.9578.

CONCLUSIONS

Radiographic measurement of MBW:AWD accurately predicted IRA from normal rotation with an optimal ratio cutoff of 0.55. Further validation will determine whether this ratio should play a role in management of incidental IRA or indeterminate findings on UGI.

LEVEL OF EVIDENCE: III.