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Endometriosis is a condition with variable location, size, and lesion composition which poses a diagnostic imaging challenge for the practicing gynecologist. Transvaginal ultrasound and magnetic resonance imaging are the most frequent imaging techniques used for its evaluation, but transvaginal ultrasound should be the first-line approach, as it is often sufficient, followed by modified ultrasound techniques. Magnetic resonance imaging should be considered when a diagnosis has not been achieved by sonographic means or when the renal system needs to be concurrently evaluated. Computed tomography has no role in the routine evaluation of endometriosis except in very few particular scenarios.