To explore the diagnostic value of ultrasound in children with omental torsion.

Collected the clinical data of 11 children with omental torsion who came to Harbin Children's Hospital from March 2017 to October 2019. A retrospective analysis was performed on the two-dimensional ultrasound images and color Doppler sonograms of 11 children with omental torsion. Ultrasound diagnostic results were compared with surgical results. The diagnostic characteristics were summarized and the reasons of missed diagnosis were analyzed.

In the 11 cases included, 7 had right upper abdomen omental torsion occurred in the right upper abdomen, 1 in the right middle abdomen, 1 in the right lower abdomen , 1 in the middle and upper abdomen , and 1 in the left upper abdomen. Preoperative ultrasound correctly diagnosed 10 cases (90.9%), but missed 1 case (9.1%). Characteristic ultrasound features included local omental thickening, echo enhancement, being mostly located in the right upper abdomen, triangle or spindle shape, and presence of "whirlpool" slightly lower echo mass in the head side of thickened omentum. Ten cases were confirmed by surgery as omentum torsion. The missed case showed inflammatory changes of the omentum at the initial diagnosis, which was finally diagnosed by surgery as omentum torsion and omental infarction.

Ultrasound diagnosis of omentum torsion in children has high accuracy and can provide a preoperative diagnostic basis for clinical treatment.