What do the pelvic MRI findings of a 3‑mm thickened uterine torus extending into the rectovaginal septum, involvement of bilateral uterosacral ligaments, tethered ovaries, mild thickening of bilateral round ligaments, and a small anterior rectal plaque (1.5 × 3.7 × 2.5 mm) indicate?

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MRI Pelvis Report Interpretation: Deep Infiltrating Endometriosis

This MRI report describes extensive deep infiltrating endometriosis (DE) involving multiple pelvic compartments, with the most significant findings being involvement of the posterior compartment (uterosacral ligaments, torus uterinus, rectovaginal septum) and anterior rectal wall, requiring multidisciplinary surgical planning.

Key Anatomical Findings Explained

Posterior Compartment Disease (Most Severe)

Torus Uterinus (3 mm thickening):

  • The torus uterinus is the posterior cervical region where the uterosacral ligaments attach
  • 3 mm thickening indicates endometriotic infiltration at this critical junction
  • This is one of the most common sites for deep endometriosis 1, 2

Bilateral Uterosacral Ligament Involvement:

  • These ligaments run from the cervix to the sacrum and are frequently affected in DE
  • Bilateral involvement suggests more extensive disease
  • MRI has 76% sensitivity and 83.3% specificity for detecting uterosacral ligament disease 1
  • This finding correlates with severe pelvic pain and dyspareunia

Rectovaginal Septum Extension (3 cm craniocaudal):

  • The disease extends inferiorly from the torus into the tissue plane between rectum and vagina
  • 3 cm longitudinal extent is substantial and clinically significant
  • MRI demonstrates 80% sensitivity and 97.8% specificity for rectovaginal septum involvement 1
  • Importantly, the report notes NO cervical myometrium or vaginal involvement, which is favorable for surgical planning

Bowel Involvement

Anterior Rectal Wall Plaque:

  • Small nodule (1.5 x 3.7 x 2.5 mm) at 7 cm above anal verge
  • Located at 12 o'clock position (anterior wall, toward vagina)
  • Critical finding: Does NOT involve muscularis propria (the muscular layer)
  • This means superficial disease amenable to rectal shaving rather than segmental resection 3
  • MRI has 88% sensitivity and 97.8% specificity for rectosigmoid disease 1

Ovarian Findings

Tethered Bilateral Ovaries:

  • Ovaries are fixed/adherent due to surrounding endometriotic adhesions
  • Previous bilateral ovarian cysts have resolved (positive comparison finding)
  • Tethering indicates adhesive disease but current absence of endometriomas

Anterior Compartment

Mild Bilateral Round Ligament Thickening (Proximal 1/3rd):

  • Represents anterior compartment involvement
  • Less clinically significant than posterior disease
  • Round ligaments run from uterine fundus through inguinal canal

Clinical Implications by Compartment

Disease Severity Assessment

According to current MRI-based compartmental analysis 4:

  • Posterior compartment: Extensive involvement (torus, bilateral USLs, rectovaginal septum)
  • Lateral compartment: Implied involvement given USL disease
  • Bowel compartment: Superficial anterior rectal involvement
  • Anterior compartment: Mild round ligament disease

Surgical Planning Considerations

Favorable Factors:

  • No cervical myometrium involvement
  • No vaginal wall involvement
  • Rectal plaque does NOT involve muscularis propria (allows rectal shaving vs. resection)
  • Resolution of ovarian cysts reduces complexity

Challenging Factors:

  • Bilateral uterosacral ligament involvement requires careful dissection
  • 3 cm rectovaginal septum extent is substantial
  • Tethered ovaries indicate adhesive disease
  • Proximity to rectum (7 cm from anal verge is mid-rectum)

MRI Diagnostic Performance Context

MRI is the optimal imaging modality for this type of disease mapping 3. The 2024 ACR Appropriateness Criteria establish that MRI pelvis (with or without contrast) is excellent for identifying deep endometriosis with overall accuracy of 90.8% for deep pelvic disease 1.

The recent 2025 ESUR consensus emphasizes compartment-based analysis exactly as demonstrated in this report 4, which facilitates:

  • Comprehensive surgical planning
  • Multidisciplinary team communication
  • Patient counseling regarding extent of disease

Common Pitfalls to Avoid

  1. Underestimating posterior compartment disease: The combination of torus, bilateral USL, and rectovaginal septum involvement indicates advanced disease requiring experienced surgical expertise

  2. Misinterpreting rectal involvement: The fact that muscularis propria is NOT involved is crucial—this determines whether rectal shaving vs. segmental resection is needed

  3. Overlooking the positive comparison: Resolution of bilateral ovarian cysts is favorable and reduces one surgical complexity

  4. Distance measurement matters: 7 cm from anal verge places this in mid-rectum, which is technically more challenging than lower rectal disease

Recommended Next Steps

Multidisciplinary surgical planning involving:

  • Gynecologic surgeon with advanced endometriosis expertise
  • Colorectal surgeon consultation given rectal involvement (even if superficial)
  • Urologic evaluation if urinary symptoms present (though no ureteral involvement noted)

Patient counseling should address:

  • Extensive posterior compartment disease requiring complex excision
  • Potential need for rectal shaving procedure
  • Risk of adhesiolysis given tethered ovaries
  • Fertility implications if relevant

The report indicates Stage IV endometriosis based on extent of deep infiltrating disease and bilateral ovarian involvement (even with resolved cysts, tethering indicates prior/ongoing disease).

References

3
Guideline

acr appropriateness criteria® endometriosis.

Journal of the American College of Radiology, 2024

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.