Introduction/Background Sonography is the first imaging test to examine women with suspected adnexal masses due to its widespread availability, relatively low cost, and high sensitivity. Magnetic resonance imaging (MRI) offers valuable information for the characterization of numerous ovarian masses. MRI can identify an adnexal mass and may be useful to differentiate between benign and malignant tumors.

Methodology A prospective study, included 32 patients with 20 years or less and with adnexal mass attending OB/GYN clinic, admitted and prepared for surgery at Mansoura University Hospitals. All patients were examined of transabdominal US or transvaginal US (for married) according to scanning conditions. Twenty-three of the studied cases had undergone pelvi-abdominal MRI. The result of Doppler ultrasound and MRI were compared to histopathology as gold standard.

Results The mean age was 17.78±3.47 (8–20) years, mean presentation was lower abdominal pain.

Of the cases with pathologically proven benign lesions; their ultrasound conclusion using IOTA simple rules revealed 86.3% were benign, 10.3% non-benign & non-malignant and 3.4% both benign & malignant detected. Of the cases with malignant lesions; 75% were malignant and 25% benign as detected by Ultrasound conclusion. Of the cases with borderline lesions; 75% are malignant and 25% both benign & malignant as detected by Ultrasound. There was a significant association between MRI findings and histopathological findings. Of the benign masses by histopathology; 90% were benign, 10% inconclusive and 0% malignant as detected by MRI. Of the malignant cases; 100% were malignant as detected by MRI. While in borderline cases; 100% were malignant by MRI.

MRI had 100% sensitivity, 90% specificity, 92.8% accuracy and ultrasound achieved 87.5% sensitivity, 96.2% specificity and 91.2% accuracy.

Conclusion There were no significant differences in sensitivity, specificity, and accuracy of Doppler ultrasound and pelvic MRI in characterization of ovarian masses in teenagers. MRI should be used for when US results are equivocal.

Disclosures No conflict of interests