3T external phased-array magnetic resonance imaging in detection of obstetric anal sphincter lesions: a pilot study

Tarja Pinta, Jyrki Ruohonen, Marja Kallio-Packalen, Ivan Zhabin, Jaan Kirss

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Background: Three-dimensional endoanal ultrasound (3D EAUS) has been the gold standard for detecting anal sphincter lesions in patients with a history of obstetric anal sphincter injury (OASI). Advances in imaging technologies have facilitated the detection of these lesions with external phased-array magnetic resonance imaging (MRI), which could offer an alternative imaging modality for the diagnosis of residual OASI (ROASI) in centers where 3D EAUS imaging is not available. Purpose: To compare two diagnostic modalities: the 3D EAUS and 3T external phased-array MRI in the detection of residual anal sphincter lesions. Material and Methods: A total of 24 women with a history of OASI were imaged with both 3D EAUS and 3T external phased-array MRI after primary repair of the injury. Intraclass correlation (ICC) and interrater reliability (IRR) values were calculated for the grade and circumference of the sphincter lesion. Sphincter lesions were graded according to the Sultan classification. Results: There was an almost perfect agreement between 3D EAUS and 3T external phased-array MRI in determining the extent of the sphincter lesions according to the Sultan classification (κ = 0.881; P < 0.001) and the circumference of the external anal sphincter defects, measured in degrees (κ = 0.896; P < 0.001). Conclusion: The results of this study indicate that 3T external phased-array MRI and 3D EAUS yield comparable results in the diagnosis of ROASI. These findings suggest that 3T external phased-array MRI could serve as an alternative diagnostic modality to 3D EAUS in the diagnosis of ROASI.

    Original languageEnglish
    JournalActa Radiologica
    DOIs
    Publication statusE-pub ahead of print - Jul 2022
    Publication typeA1 Journal article-refereed

    Keywords

    • endoanal ultrasound
    • fecal incontinence
    • Magnetic resonance imaging
    • obstetric anal sphincter injury
    • obstetric trauma
    • perineal injury

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Radiological and Ultrasound Technology
    • Radiology Nuclear Medicine and imaging

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