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

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.