O-RADS MRI score: analysis of misclassified cases in a prospective multicentric European cohort

To retrospectively review the causes of categorization errors using O-RADS-MRI score and to determine presumptive these misclassifications. EURAD database was queried identify misclassified lesions. In this cohort, 1194 evaluable patients with 1502 pelvic masses (277 malignant / 1225 benign lesions) underwent standardized MRI characterize adnexal histology or 2 years’ follow-up as a reference standard. An expert radiologist reviewed cases two junior radiologists lesions termed if lesion scored ? 3, ? 4, site origin incorrect, non-adnexal mass incorrectly categorized malignant. There were 139 (9.2%) in 116 women including 109 30 masses. False-negative corresponded 16 borderline invasive rated 3 (16 139, 11.5%). False-positive 88 4 (67 48.2%) 5 (18 139,12.9%) considered suspicious (3 2.2%). Misclassifications only due error 12 (8 benign, malignant) (8.6%, 139) 23 malignant,16.5%, perceived respectively Interpretive (n = 104), failure recognize technical insufficient exams 9), perceptual 4) found. Most interpretive misinterpretation solid tissue incorrect assignment origin. Eighty-four out correctly reclassified by readers strict adherence rules. • Prospective resulted misclassification 9.25% sonographically indeterminate (74.8%) defined lexicon Pelvic inflammatory disease is common source (8.9%) (12 139).