Purpose To investigate the conventional ultrasound and contrast-enhanced ultrasound features of epiploic appendagitis (EA). Materials and Methods A retrospective study was performed on 23 patients who were diagnosed with EA in the 907th Hospital of Chinese People's Liberation Army Joint Logistic Support Force from May 2016 to May 2023. The conventional and contrast-enhanced ultrasound findings were analyzed,and the subsequent evolution of ultrasound findings were followed up. Results All 23 patients presented with a solitary mass adjacent to the colon or cecum,with eleven masses being oval,eight being elliptical and four irregular in shape. The margin of the mass was clear in 15 cases,with 12 cases showing a linear hypoechoic rim around the mass. All 23 masses appeared as solid hyperechoic lesions,with two cases showing internal inhomogeneous echoes and linear hypoechoic areas,three cases showing mild thickening of the adjacent intestinal wall and 19 cases showing adhesion to the anterior abdominal wall and fixed in position. No obvious blood flow signals were detected inside the masses in all 23 cases,while only five cases showing slight blood flow signals around the mass periphery. Contrast-enhanced ultrasound demonstrated that the central part of the mass did not enhance,while the edge of the mass showed a ring-shaped hyperenhancement with a thickness of approximately 0.20-1.50 cm in ten patients. Follow-up ultrasound examinations were performed in 12 patients,and the results showed that seven patients had complete disappearance of the initial mass,with one patient found to have a loose body in the rectouterine pouch,and the volume of the mass in the remaining five patients showed varying degrees of reduction during the follow-up period. Conclusion The characteristics of contrast-enhanced ultrasound in EA include a central necrotic area without enhancement,showing a ring-shaped enhancement at the edge. Contrast-enhanced ultrasound is a highly effective imaging modality that can provide strong evidence for the clinical diagnosis of EA by visualizing the size and extent of the infarcted epiploic appendage.

Purpose To investigate the conventional ultrasound and contrast-enhanced ultrasound features of epiploic appendagitis (EA). Materials and Methods A retrospective study was performed on 23 patients who were diagnosed with EA in the 907th Hospital of Chinese People's Liberation Army Joint Logistic Support Force from May 2016 to May 2023. The conventional and contrast-enhanced ultrasound findings were analyzed,and the subsequent evolution of ultrasound findings were followed up. Results All 23 patients presented with a solitary mass adjacent to the colon or cecum,with eleven masses being oval,eight being elliptical and four irregular in shape. The margin of the mass was clear in 15 cases,with 12 cases showing a linear hypoechoic rim around the mass. All 23 masses appeared as solid hyperechoic lesions,with two cases showing internal inhomogeneous echoes and linear hypoechoic areas,three cases showing mild thickening of the adjacent intestinal wall and 19 cases showing adhesion to the anterior abdominal wall and fixed in position. No obvious blood flow signals were detected inside the masses in all 23 cases,while only five cases showing slight blood flow signals around the mass periphery. Contrast-enhanced ultrasound demonstrated that the central part of the mass did not enhance,while the edge of the mass showed a ring-shaped hyperenhancement with a thickness of approximately 0.20-1.50 cm in ten patients. Follow-up ultrasound examinations were performed in 12 patients,and the results showed that seven patients had complete disappearance of the initial mass,with one patient found to have a loose body in the rectouterine pouch,and the volume of the mass in the remaining five patients showed varying degrees of reduction during the follow-up period. Conclusion The characteristics of contrast-enhanced ultrasound in EA include a central necrotic area without enhancement,showing a ring-shaped enhancement at the edge. Contrast-enhanced ultrasound is a highly effective imaging modality that can provide strong evidence for the clinical diagnosis of EA by visualizing the size and extent of the infarcted epiploic appendage.

Objective To investigate the ultrasonic appearance of peripheral neurilemmoma.Methods Ultrasonic appearances of 43 patients with 46 neurilemmomas confirmed by surgery and pathology were analyzed retrospectively and compared with their MRI and pathological features.Results Forty-five neurilemmomas were with regular shape and clear boundary,except one at the root of nerve C4 that was irregular in shape and unclear in boundary,like adumbbell.Sonography showed that there were 30 neurilemmomas displaying as solid tumors,15 as cystic and solid,and 1 as entirely cystic.Posterior echoenhancement,target sign,rat tail sign and vessels accompanying sign were found in 39,21,23 and 17 neurilemmomas,respectively.There were 4 neurilemmomas with ultrasound blood flow grade 0,9 with grade Ⅰ,22 with gradeⅡ,and 11 with grade Ⅲ.The target signs were found in 21 cases (21/46,45.6％) and 26 cases (26/46,56.5 ％) by ultrasound and MRI,respectively.The capability of ultrasound finding the target sign in neurilemmoma was comparable to MRI(Kappa =0.527,P ＜0.001).The diagnostic accuracy rate of neurilemmoma by ultrasonography was 73.9％(34/46).Conclusions The ultrasound has a relatively high detection of the target sign in neurilemmoma,which may provide a new basis for the ultrasonic diagnosis of neurilemmoma.