Injuries to the levator ani in unexplained, chronic pelvic pain

The Known, the Unknown and the Future of the Pathophysiology of Endometriosis

Endometriosis is one of the most common causes of chronic pelvic pain and infertility, affecting 10% of women of reproductive age. A delay of up to 9 years is estimated between the onset of symptoms and the diagnosis of endometriosis. Endometriosis is currently defined as the presence of endometrial epithelial and stromal cells at ectopic sites; however, advances in research on endometriosis have some authors believing that endometriosis should be re-defined as "a fibrotic condition in which endometrial stroma and epithelium can be identified". There are several theories on the etiology of the disease, but the origin of endometriosis remains unclear. This review addresses the role of microRNAs (miRNAs), which are naturally occurring post-transcriptional regulatory molecules, in endometriotic lesion development, the inflammatory environment within the peritoneal cavity, including the role that cytokines play during the development of the disease, and how animal models have helped in our understanding of the pathology of this enigmatic disease.

ACR Appropriateness Criteria® Postmenopausal Subacute or Chronic Pelvic Pain

Pelvic pain is common in both reproductive age and postmenopausal women, and the major etiologies change throughout the life cycle. Chronic pain is defined as lasting for at least 6 months. There are many gastrointestinal and urinary disorders associated with chronic pain in this age group, which are not discussed in this guideline. Pain may be localized to the deep pelvis, with potential causes including pelvic congestion syndrome, intraperitoneal adhesions, hydrosalpinx, chronic inflammatory disease, or cervical stenosis. Ultrasound is the initial imaging modality of choice, while CT and MRI may be appropriate for further characterization of sonographic findings. Alternatively, pain may be localized to the vagina, vulva, or perineum, with potential causes including vaginal atrophy, vaginismus, vaginal or vulvar cysts, vulvodynia, or pelvic myofascial pain. Imaging is primarily indicated in context of an abnormal physical exam and ultrasound is the initial modality of choice, while MRI may be appropriate for further characterization in select cases. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision include an extensive analysis of current medical literature from peer reviewed journals and the application of well-established methodologies (RAND/UCLA Appropriateness Method and Grading of Recommendations Assessment, Development, and Evaluation or GRADE) to rate the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where evidence is lacking or equivocal, expert opinion may supplement the available evidence to recommend imaging or treatment.

Pelvic pain and mode of delivery

OBJECTIVE

We sought to determine the long-term effect of mode of delivery on the prevalence and severity of pelvic pain.

STUDY DESIGN

Six to eleven years after a first delivery, pelvic pain (dysmenorrhea, dyspareunia, and pelvic pain not related to menses or intercourse) was measured using the Oxfordshire Women's Health Study Questionnaire. Obstetrical exposures were assessed by review of the hospital delivery record. The prevalence of moderate to severe pelvic pain was compared between the 577 women who delivered via cesarean for all births and the 538 who delivered at least 1 child vaginally. Other obstetrical exposures were also studied.

RESULTS

Prevalence of pelvic pain was similar between women who delivered vaginally and by cesarean. Among women who delivered vaginally, those who experienced at least 1 forceps delivery and women who delivered at least 1 baby ≥4 kg vaginally reported a higher rate of dyspareunia. Perineal trauma was not associated with dyspareunia.

CONCLUSION

Forceps delivery and a vaginal delivery of a baby ≥4 kg are associated with dyspareunia 6-11 years after vaginal birth. Vaginal birth is not associated with a higher rate of pelvic pain when compared to cesarean delivery.

Obstetric levator ani muscle injuries: current status

Levator ani muscle (LAM) injuries occur in 13-36% of women who have a vaginal delivery. Although these injuries were first described using magnetic resonance imaging, three-dimensional transperineal and endovaginal ultrasound has emerged as a more readily available and economic alternative to identify LAM morphology. Injury to the LAM is attributed to vaginal delivery resulting in reduced pelvic floor muscle strength, enlargement of the vaginal hiatus and pelvic organ prolapse. There is inconclusive evidence to support an association between LAM injuries and stress urinary incontinence and there seems to be a trend towards the development of fecal incontinence. Longitudinal studies with long-term follow-up assessing the LAM before and after childbirth are lacking. Furthermore, the consequence of LAM injuries on quality of life due to prolapse and/or urinary and fecal incontinence have not been evaluated using validated questionnaires. Direct comparative studies using the above-mentioned imaging modalities are needed to determine the true gold standard for the diagnosis of LAM injuries. This would enable consistency in definition and classification of LAM injuries. Only then could high-risk groups be identified and preventive strategies implemented in obstetric practice.

Avulsion of the Levator Ani in a Young Adult Male by Blunt Trauma

A young adult male equestrian sustained an avulsion of his levator ani muscle and its bony origin secondary to a horse landing on his groin. Avulsion of the levator ani muscle has, to our knowledge, only been described in obstetric related injuries. We describe the findings on CT imaging of this traumatic blunt injury.