What are the novel findings of this work?Quality of studies assessing the role of different ultrasound signs for diagnosing adnexal torsion was moderate. There is significant heterogeneity among studies.Therefore, investigating this unique clinical issue using meta-analysis might lead to erroneous conclusions as to the diagnostic capabilities of sonographic signs in the diagnosis of adnexal torsion. What are the clinical implications of this work?This meta-analysis shows the current evidence about the role of ultrasound in diagnosing adnexal torsion. Most of the classical ultrasound signs are specific for diagnosing this entity. These findings support the use of ultrasound in this clinical