الفهرس 
? Anatomy of the Female PelvisOnly 14 pages are availabe for public view
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Abstract
Background: Determining whether a clinically diagnosed adnexal mass is benign or malignant is frequently not possible until surgical exploration and histologic examination are performed. Consequently, it may not be possible to decide preoperatively whether conservative or radical surgery is appropriate. A reliable method with which to differentiate a benign from a malignant adnexal mass would provide a basis for optimal preoperative planning.
Objectives: To describe the role of conventional magnetic resonance imaging (MRI) in assessment of cystic lesions of the female pelvis and assess the ability of conventional MRI to successfully differentiate benign from malignant lesions.
Patients and Methods: Our study was conducted on twenty (21) complex adnexal lesions, conventional MRI suggested malignant pathology in three masses; all proved to be malignant. MRI also suggested borderline pathology in four masses, two of them were truly borderline tumors, while one of them was proven to be benign and the last was histopathologically proven malignant. Conventional MRI also suggested benign pathology in fourteen lesions; all of them were true benign. MRI had shown 93.3% sensitivity, 100% specificity, 95.2% accuracy, 100% positive predictive value and 85.7% negative predictive value in its individual performance during the assessment of the included adnexal masses.
Results: Nine patients presented by lower abdominal pain or discomfort, three patients were complaining of abdominal enlargement, two complained of menstrual irregularity, three patients presented with low/high grade fever and four were accidentally discovered on routine pelvi-abdominal US examination. selection and primary assessment of the cases by Pelvic ultrasound was done. The detected adnexal lesions varied between complex cystic masses (38.1%), multilocular cystic masses (42.9%), bilocular cystic masses (14.3%) and heterogeneous cystic lesion (4.8%). Considering the signal intensity, hyper intense T1 signal was seen in (23.8%), intermediate signal in (14.3%), and hypo-intense signal in (61.9%).Hyper-intense T2 signal was seen in (71.4%), intermediate signal intensity (9.5%), low signal (9.5%), and heterogeneous signal (9.5%).The complex adnexal masses showed variable contrast uptake either enhanced (24.2%) or mildly enhanced (47.2%) or no appreciable enhancement (28.6%).
Conclusion: Conventional MR imaging proved to exhibits high sensitivity and specificity for differentiating benign from malignant complex adnexal lesions.