Background: In evaluation of adnexal masses ultrasound serves an important initial modality but MRI, due to its excellent soft tissue resolution, serves as a problem solving tool in assessing the organ of origin and characterization of tissue components. Methods: This is a hospital based prospective comparative study conducted in postgraduate department of Hamdard Institute of Medical Sciences and Research, New Delhi where in patients with sonographically labelled Endometriotic and hemorrhagic cysts were subjected to MRI for further characterization. Results: we conducted a study on 86 patients out of which 56 patients were labelled as Endometriomas and 30 patients were labelled as Hemorrhagic cysts. MRI characterized 52 patients with endometriomas corresponding 60 % and 25 patients as Hemorrhagic cysts corresponding to 29 % whereas 4 of sonographically labelled Endometriotic cysts turned out to dermoid on MRI and 5 patients labelled as Hemorrhagic cysts turned out to cyst adenomas On MRI and so on Histopathological correlation. Conclusion: Sonography is initial modality of choice in evaluating the adnexal masses, but MRI is problem solving tool in characterizing the tissue content and organ of origin.