Abstract: Objective: To analyze the causes of ultrasound misdiagnosis of low position intestinal tumor in female patients for improving the preoperative diagnosis. Method: To review and analyze eighteen women with surgically and pathologically proved low position intestinal tumor who had been misdiagnosed as gynecologic tumor preoperatively by ultrasonography between 2008 and 2015.The causes of misdiagnosis were analyzed. Result: Imaging of preoperative ultrasonography denoted as gynecological tumor in 12 cases and did not reveal the source in other 6 cases. The mass was of cystic and solid echo in fifteen cases, hypoechoic in two cases, and anechoic in one case. Operative exploration revealed that the mass was from small intestine in all the cases and hence resection of the small intestine tumor was conducted. Pathological findings showed that 16 cases were small intestinal stromal tumor, one was small intestinal leiomyoma and one was intestinal deformity. Conclusions: Low position intestinal tumor in women are often misdiagnosed as uterine appendage tumor. Ultrasound is a preferred approach of examination, and special focus should be paid on the identification of blood supply and the relationship between the tumor and uterine appendage.

Key words: Low position intestinal tumors, Ultrasonography, Small intestine