Introduction: Imaging for Endometriosis — A Necessary Prerequisite
While the gold standard in the diagnosis of endometriosis remains laparoscopy, it is now recognized that thorough evaluation via ultrasound offers an acceptable, less expensive, and less invasive alternative. It is especially useful for the diagnosis of deep infiltrative disease, which penetrates more than 5 mm into the peritoneum, ovarian endometrioma, and when anatomic distortion occurs, such as to the path of the ureter.
Besides establishing the diagnosis, ultrasound imaging has become, along with MRI, the most important aid for proper preoperative planning. Not only does imaging provide the surgeon and patient with knowledge regarding the extent of the upcoming procedure, but it also allows the minimally invasive gynecologic (MIG) surgeon to involve colleagues, such as colorectal surgeons or urologists. For example, deep infiltrative endometriosis penetrating into the bowel mucosa will require a discoid or segmental bowel resection.
Dr. Charles E. Miller
While many endometriosis experts rely on MRI, many MIG surgeons are dependent on ultrasound. I would not consider taking a patient with signs and symptoms suggestive of endometriosis to surgery without 2D/3D transvaginal ultrasound. If the patient possesses a uterus, a saline-infused sonogram is performed to potentially diagnose adenomyosis.
It is a pleasure and honor to welcome Professor Caterina Exacoustos MD, PhD, associate professor of ob.gyn. at the University of Rome “Tor Vergata,” to this edition of the Master Class in Gynecologic Surgery to discuss “Ultrasound and Its Role in the Diagnosis of and Management of Endometriosis, Including DIE.”
Prof. Exacoustos’ main areas of interest are endometriosis and benign diseases including uterine pathology and infertility. Her extensive body of work comprises over 120 scientific publications and numerous book chapters both in English and in Italian.
Prof. Exacoustos continues to be one of the most well respected lecturers speaking about ultrasound throughout the world.
Dr. Miller is professor of obstetrics and gynecology, department of clinical sciences, Rosalind Franklin University of Medicine and Science, North Chicago. Dr. Miller has no conflicts of interest to report.
Ultrasound and Its Role In Diagnosing and Managing Endometriosis
Endometriosis affects approximately 10%-20% of premenopausal women worldwide. It is the leading cause of chronic pelvic pain, is often associated with infertility, and has a significant impact on quality of life. Although the natural history of endometriosis remains unknown, emerging evidence suggests that the pathophysiological steps of initiation and development of endometriosis must occur earlier in the lifespan. Most notably, the onset of endometriosis-associated pain symptoms is often reported during adolescence and young adulthood.1
While many patients with endometriosis are referred with dysmenorrhea at a young age, at age ≤ 25 years,2 symptoms are often highly underestimated and considered to be normal and transient.3,4 Clinical and pelvic exams are often negative in young women, and delays in endometriosis diagnosis are well known.
The presentation of primary dysmenorrhea with no anatomical cause embodies the paradigm that dysmenorrhea in adolescents is most often an insignificant disorder. This perspective is probably a root cause of delayed endometriosis diagnosis in young patients. However, another issue behind delayed diagnosis is the reluctance of the physician to perform a diagnostic laparoscopy — historically the gold standard for diagnosing endometriosis — for seemingly common symptoms such as dysmenorrhea in young patients.
Today we know that there are typical aspects of ultrasound imaging that identify endometriosis in the pelvis, and notably, the 2022 European Society for Human Reproduction and Embryology (ESHRE) endometriosis guideline5 recognizes imaging (ultrasound or MRI) as the standard for endometriosis diagnosis without requiring laparoscopic or histological confirmation.
An early and noninvasive method of diagnosis aids in timely diagnosis and provides for the timely initiation of medical management to improve quality of life and prevent progression of disease (Figure 1).
Dr. Exacoustos
Figure 1: Endometrioma and adenomyosis
(A. Transvaginal ultrasound appearance of a small ovarian endometrioma in a 16-year-old girl. Note the unilocular cyst with ground glass echogenicity surrounded by multifollicular ovarian tissue. B. Ultrasound image of a retroverted uterus of an 18-year-old girl with focal adenomyosis of the posterior wall. Note the round cystic anechoic areas in the inner myometrium or junctional zone. The small intra-myometrial cyst is surrounded by a hyperechoic ring).
Indeed, the typical appearance of endometriotic pelvic lesions on transvaginal sonography, such as endometriomas and rectal deep infiltrating endometriosis (DIE) — as well as adenomyosis – can be medically treated without histologic confirmation .
When surgery is advisable, ultrasound findings also play a valuable role in presurgical staging, planning, and counseling for patients of all ages. Determining the extent and location of DIE preoperatively, for instance, facilitates the engagement of the appropriate surgical specialists so that multiple surgeries can be avoided. It also enables patients to be optimally informed before surgery of possible outcomes and complications.
Moreover, in the context of infertility, ultrasound can be a valuable tool for understanding uterine pathology and assessing for adenomyosis so that affected patients may be treated surgically or medically before turning to assisted reproductive technology.