Objective To investigate the value of ultrasonography in the diagnosis of pelvic cystic masses

so as to provide a reference for clinical diagnosis and treatment of this disease. Methods A total of 120 patients with pelvic cystic mass who underwent examinations in Shenyang Women’s and Children’s Hospital from January 2018 to January 2021 were selected as the study subjects. All patients received the ultrasound examination after admission. The ultrasonographic features of patients with cystic masses of different natures were analyzed. The accuracy

misdiagnosis

and missed diagnosis rates of ultrasound scanning were statistically analyzed in combination with the results of surgical pathology. Results Of the 120 cases

70 were benign and 50 were malignant. The diagnostic accuracy

misdiagnosis

and missed diagnosis rates were 92.50%（111/120）

4.17%（5/120）

and 3.33%（4/120）

respectively. Ultrasonographic features of benign masses: the diameter of the mass was small

the boundary was clear and the shape was regular

the echo distribution was weak or anechoic

the pelvic wall was accompanied by acoustic shadow light mass

and most of them presented multilocular features unilaterally. The tumor wall was thickened but the blood flow signal was weak

the Adler blood flow grade was mostly grade 1-2

and the blood flow resistance index RI was <0.7. Ultrasonographic features of malignant mass: large diameter

blurred boundary and irregular shape

punctate hyperechoic distribution

massive ascites

poor penetration

rich blood flow signals inside the thickened tumor wall

Adler blood flow grade mostly grade 3

and blood flow resistance index RI≥0.7. Conclusion Ultrasonography can effectively differentiate benign and malignant cystic masses by observing the diameter

boundary

shape

echo distribution

and blood flow signal in pelvic cystic masses. It has a high diagnostic accuracy for diseases and a low rate of misdiagnosis and missed diagnosis. These benefits justify a wider application of this procedure in clinical practice.