The goal of this prospective observational study is to learn whether magnetic resonance imaging (MRI) findings can help predict treatment response to dienogest in women with endometriosis. Endometriosis is a common gynecologic condition that can cause chronic pelvic pain and negatively affect quality of life. Although dienogest is widely used as a standard medical treatment, individual responses to treatment vary. The main questions this study aims to answer are: * Whether baseline MRI characteristics of endometriotic lesions are associated with improvement in pelvic pain after dienogest treatment. * Whether MRI findings can help identify patients who are more likely to benefit from dienogest therapy. Participants diagnosed with endometriosis who are prescribed dienogest as part of their routine clinical care will be enrolled. This study does not assign any investigational intervention. Participants will undergo standard clinical follow-up, including pelvic pain assessment using visual analog scale (VAS) scores, quality of life questionnaires, and routine MRI examinations. Clinical and imaging data will be collected prospectively and analyzed to explore imaging predictors of treatment response.
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Change in pelvic pain severity assessed by visual analog scale.
Timeframe: Baseline to 12 months after initiation of dienogest treatment