Pelvic organ prolapse occurs when the muscles, ligaments, and connective tissues that support the pelvic organs weaken, allowing the bladder, uterus, rectum, or small bowel to descend into or through the vagina. It affects approximately one in four women over the age of 40 and is one of the most common reasons for gynecologic surgery in the United States.
Pelvic organ prolapse frequently coexists with other structural pelvic conditions. Women with prolapse often have concurrent uterine fibroids or prior hysterectomy — which itself is a risk factor for vaginal vault prolapse by removing the uterine ligament support structure. Adenomyosis and endometriosis can cause pelvic floor dysfunction that contributes to the symptom burden of prolapse. The urinary symptoms of prolapse — urgency, frequency, incomplete emptying — overlap significantly with those of other pelvic floor disorders, and dynamic pelvic floor MRI is the only imaging study that simultaneously evaluates all three pelvic compartments and their interrelationships, providing information that physical examination alone cannot reliably determine.
Causes
Pregnancy and childbirth.
Vaginal delivery is the single most important modifiable cause of pelvic organ prolapse. The pelvic floor musculature — particularly the levator ani complex, which forms the hammock-like floor of the pelvis — and the uterosacral and cardinal ligaments can be stretched, avulsed, or denervated during labor and delivery, sometimes catastrophically and often silently. The puborectalis and pubococcygeus muscles are most vulnerable during the second stage of labor, when the fetal head descends through the levator hiatus. Risk is substantially elevated by multiple vaginal births, birth weight above 4 kg, prolonged second-stage labor, instrumental delivery (forceps more so than vacuum), and significant obstetric laceration. Levator ani avulsion injury — the complete detachment of the puborectalis from its pubic bone insertion — occurs in approximately 10–30% of vaginal deliveries and is a major structural basis for subsequent prolapse, detectable on MRI years after delivery.
Other contributing factors.
Aging and menopause combine to reduce tissue elasticity and pelvic floor muscle mass — estrogen plays a critical role in maintaining the collagen content and tensile strength of the pelvic supporting ligaments, and its loss at menopause accelerates connective tissue degradation. Obesity increases chronic intra-abdominal pressure transmitted to the pelvic floor with every step. Chronic constipation with habitual straining at defecation, chronic cough (in smokers, asthmatics, or patients with COPD), and repetitive heavy lifting similarly elevate intra-abdominal pressure chronically. Prior hysterectomy — even without concurrent prolapse repair — removes the central structural anchor of the pelvic support complex and is an independent risk factor for subsequent vault prolapse. Genetic factors affecting connective tissue quality, including Ehlers-Danlos syndrome, predispose to earlier and more severe prolapse.
Symptoms
Many women with anatomically demonstrable prolapse have no or minimal symptoms, and treatment decisions are appropriately guided by symptom burden rather than anatomic findings alone. As prolapse becomes more significant, the most distinctive symptom is a feeling of pelvic heaviness, pressure, or fullness — particularly after prolonged standing or at the end of the day — and a visible or palpable vaginal bulge that the patient may notice when bathing or wiping. Urinary symptoms are common and include stress incontinence, urgency and frequency from bladder displacement, difficulty initiating urination, and a sense of incomplete bladder emptying that can lead to recurrent urinary tract infections. Bowel symptoms — including difficulty evacuating, the need to digitally splint (manually press on the vaginal wall to facilitate defecation), and a sense of incomplete rectal emptying — suggest significant posterior compartment involvement. Dyspareunia (pain with intercourse) and low back pain are additional complaints. The classic symptom of needing to manually reduce the prolapse to initiate urination or defecation indicates advanced-stage disease.
Diagnosis
Pelvic examination — performed both at rest and with the patient straining (Valsalva maneuver) in the dorsal lithotomy and standing positions — is the primary diagnostic method and allows direct visualization and POP-Q (Pelvic Organ Prolapse Quantification) staging. However, physical examination has well-recognized limitations for posterior compartment pathology (enterocele is frequently missed) and for understanding the structural basis of prolapse in complex or recurrent cases.
Dynamic pelvic floor MRI (MR defecography) is the most comprehensive imaging study for pelvic organ prolapse evaluation. Images are obtained at rest, during maximal pelvic floor contraction, and during maximal straining — capturing the dynamic behavior of all three pelvic compartments simultaneously. MRI quantifies the degree of descent of each organ relative to standardized reference lines (the pubococcygeal line and the H and M lines), identifies enteroceles and peritoneoceles that are frequently missed on examination, evaluates levator ani muscle integrity including avulsion injuries, and assesses the structural causes of recurrent prolapse after prior surgery — including mesh complications, suture failure, and persistent defects. This information is essential for tailoring the surgical repair to the specific anatomic defects present rather than performing a generic procedure.
Classification
Prolapse is classified by the compartment and organ involved, and graded by degree of descent.
- Cystocele (anterior compartment): Prolapse of the bladder into the anterior vaginal wall. The most common type. Associated with urinary symptoms including incomplete emptying and stress incontinence.
- Rectocele (posterior compartment): Prolapse of the rectum into the posterior vaginal wall. Associated with difficulty evacuating and the need for digital splinting. Best evaluated with dynamic MRI or defecography.
- Enterocele (apical posterior compartment): Herniation of the small bowel or peritoneum into the upper vaginal space. Frequently coexists with vault prolapse and is often missed on clinical examination — dynamic MRI is the most reliable detection method.
- Uterine prolapse (apical compartment): Descent of the uterus into the vaginal canal. Graded from first-degree (cervix above the hymen) through third-degree (complete procidentia, uterus fully outside the vaginal opening).
- Vaginal vault prolapse (apical compartment, post-hysterectomy): Descent of the vaginal apex after hysterectomy, often with associated enterocele. Can be severe and symptomatic even when prior hysterectomy was performed for entirely different reasons.
The POP-Q system grades severity from Stage 0 (no prolapse) through Stage IV (complete eversion of the vaginal walls through the introitus).
Treatments
Treatment is individualized based on symptom severity, prolapse type and stage, age, sexual activity, desire for future pregnancy, and overall health status. Asymptomatic or minimally symptomatic prolapse does not require intervention beyond observation and lifestyle modification.
Conservative care: Pelvic floor physical therapy with a specialized pelvic floor physiotherapist — including progressive Kegel exercises, coordinated relaxation and contraction training, and biofeedback — is the first-line treatment for symptomatic prolapse and can improve symptoms substantially in mild to moderate cases. Weight loss, management of chronic constipation with dietary fiber and stool softeners, treatment of chronic cough, and avoidance of repetitive heavy lifting reduce the chronic loading that drives progression. Vaginal estrogen therapy in postmenopausal women improves tissue quality and may slow progression.
Pessaries.
A pessary is a removable silicone support device inserted into the vagina to mechanically reduce and support the prolapsing organs. Pessaries are available in numerous shapes and sizes — ring, Gellhorn, cube, and others — fitted individually to the patient's anatomy. They are an excellent long-term option for women who are not surgical candidates due to medical comorbidities, those who decline surgery, or those who wish to defer surgical treatment. Many women use pessaries successfully for years with regular removal, cleaning, and follow-up. Vaginal estrogen cream used concurrently optimizes tissue health and reduces the risk of pessary-related erosion.
Surgery.
Surgical repair is indicated for symptomatic prolapse that has not responded adequately to conservative management. The surgical approach — vaginal, abdominal, laparoscopic, or robotic — and the specific procedure are determined by prolapse type, prior surgical history, and patient factors. Native tissue repairs reinforce the vaginal walls using the patient's own tissues and ligaments (uterosacral ligament suspension, sacrospinous ligament fixation for apical support). Abdominal sacrocolpopexy — attaching a mesh or biologic graft from the vaginal apex to the sacral promontory — provides durable apical support and is the gold standard for vault prolapse repair. Mesh-augmented vaginal repairs offer additional structural reinforcement but carry risks of mesh exposure, erosion, and pain that must be carefully discussed preoperatively given the FDA's prior warnings about transvaginal mesh. Dynamic pelvic floor MRI is invaluable preoperatively for mapping the specific defects requiring repair and postoperatively for evaluating the anatomic result and any complications.
Get an MRI to Confirm Your Diagnosis
Before surgical planning or starting treatment, a clear MRI diagnosis ensures the right path forward. First Look MRI offers self-pay Pelvis MRI scans — no doctor's order or insurance required — at our locations in Georgia, Texas, and Colorado.