What question did this study set out to answer?

This study aims to investigate morphological differences in superficial perineal muscles between women with pelvic organ prolapse and control groups.

February 12, 2026Open Access

A Comparative MRI Study of Superficial Perineal Musculature in Women with Pelvic Organ Prolapse, and in Parous and Nulliparous Controls

YLYanhua LiuChinese Academy of Medical Sciences & Peking Union Medical College YZYing ZhouPeking University MZMengyu ZhangPeking University

Key Points

This study aims to investigate morphological differences in superficial perineal muscles between women with pelvic organ prolapse and control groups.
Conducted a comparative MRI analysis of superficial perineal musculature
Compared women with pelvic organ prolapse to parous and nulliparous controls
Measured volume, length, and width of BCM and STPM
Observed significant reduction in BCM volume in women with pelvic organ prolapse
Noted decreases in length, width, and volume of STPM among the same group
Found a correlation between BCM rupture and increased colorectal-anal symptoms and prolapse severity

Abstract

Superficial perineal muscles, particularly the BCM and STPM, show significant morphological differences in women with POP. These differences include a reduction in the volume of BCM, as well as decreases in the length, width, and volume of the STPM. Rupture of the BCM is associated with colorectal-anal and prolapse symptom severity. Quantitative MRI assessment of these structures could serve as a valuable biomarker for evaluating pelvic floor support and POP risk.

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