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Objective: This study aimed to evaluate magnetic resonance imaging (MRI) features and interobserver agreement of endometrial polyps.

Methods: After institutional review board approval, our database was searched for women older than 18 years who underwent MRI pelvis and pelvic surgical intervention from 2012 to 2016. Seventy-two patients with polyps and 75 controls composed the study cohort. Two radiologists evaluated the MRIs retrospectively for polyps. Polyp characteristics and enhancement were assessed.

Results: Sensitivity and specificity of readers 1 and 2 were 59.7% and 88.0%, and 44.4 and 96.0%, respectively. There was moderate agreement for presence of polyps ([kappa] = 0.556, P <= 0001), T2 fibrous core, and intratumoral cysts, with slight agreement for T2 signal and enhancement. Polyp size moderately correlated with pathology ([kappa] = 0.465 [P = 0.025] for reader 1, [kappa] = 0.562 [P = 0.029] for reader 2). The most common enhancement was same as myometrium.

Conclusion: Magnetic resonance imaging is moderately sensitive for detecting endometrial polyps, demonstrating features that are not sensitive but can be specific, with moderate interobserver agreement.

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