OC27.06: Ultrasound features of rare primary malignant ovarian tumors

surgical and pathological findings. Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy with respect to the residual disease after laparotomy have been calculated for each US parameters. Results: At laparotomy, 78 patients (53%) were considered to suffer from unresectable disease and in 6 patients (0.4%) cytoreductive surgery was undertaken, resulting in suboptimal residual disease (RT >1 cm). The accuracy of the US parameters with laparotomic findings ranged between 81% for mesenteric retraction and 98% for ascites. The overall accuracy rate of the US parameters with regard the unresectable disease ranged between 52%, for superficial liver metastases, and 65% for peritoneal carcinomatosis, omental involvement and ascites. Conclusions: Preoperative US examination might represent a valid tool to assess the intrabdominal extension of ovarian cancer disease. Further analyses are necessary to explore the role of the US examination in predicting optimal cytoreduction.