# Retroverted Uterus and Incarceration

> NEET-PG Obstetrics and Gynaecology notes on retroverted uterus and incarceration at 12 to 14 weeks, covering urinary retention and reposition.

- Canonical URL: https://prepelephant.com/topics/neet-pg/obstetrics-and-gynaecology/retroverted-uterus-and-incarceration
- Exam / course: NEET-PG · Subject: Obstetrics and Gynaecology
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-08
- Last updated: 2026-10-08
- Reference basis: Williams Obstetrics; Williams Gynecology; D.C. Dutta's Textbook of Obstetrics
- How to cite: "Retroverted Uterus and Incarceration", PrepElephant, https://prepelephant.com/topics/neet-pg/obstetrics-and-gynaecology/retroverted-uterus-and-incarceration

## Direct answer

A retroverted uterus tilts backwards, and incarceration occurs when it is impacted in the pelvis, in the pouch of Douglas below the sacral promontory, often with adhesions, typically at 12 to 14 weeks of pregnancy as the uterus rises out of the pelvis. Incarceration causes acute urinary retention by compressing the bladder. The first step is catheterisation, followed by knee-chest position or bimanual reposition to bring the uterus forward. A mobile retroverted uterus usually rises spontaneously by about 12 weeks.

## What you must remember

- **Retroversion:** a common anatomical variant in which the fundus tips backwards, usually mobile and harmless.
- **Incarceration:** the uterus becomes impacted in the pouch of Douglas, often fixed by adhesions from endometriosis, pelvic infection or previous surgery.
- **Timing:** presentation at 12 to 14 weeks, when the uterus should rise out of the pelvis but cannot.
- **Presentation:** acute urinary retention with suprapubic fullness and inability to pass urine, sometimes with pelvic pain.
- **Diagnosis:** bimanual examination shows an enlarged, retroverted uterus fixed in the pouch; ultrasound confirms pregnancy and fetal wellbeing.
- **Management:** catheterise first, then knee-chest position or manual reposition under anaesthesia; laparoscopic release is reserved for recurrence.
- **Complication:** delayed catheterisation can overdistend the bladder and cause lasting detrusor damage.

## A woman who cannot pass urine at 13 weeks

A 13-week pregnant woman has suprapubic discomfort and has passed no urine for several hours. Retention in pregnancy at this gestation is incarceration until proved otherwise, and a bimanual examination is the quickest way to confirm it. The steps below follow the standard sequence, which begins with the bladder.

1. **Confirm the diagnosis:** bimanual examination finds an enlarged, retroverted uterus fixed in the pouch of Douglas.
2. **Empty the bladder:** a urethral catheter drains the retained urine, relieving pressure on the bladder neck.
3. **Try the knee-chest position:** this lets the uterus fall forward out of the pelvis under gravity.
4. **Attempt manual reposition:** gentle bimanual pressure under anaesthesia lifts the fundus upward and forward.
5. **Check and monitor:** repeat ultrasound confirms fetal wellbeing, and bladder function is checked after reposition.
6. **Escalate if persistent:** laparoscopic release or specialist surgical care is considered for recurrent incarceration.

## Where the exam tries to catch you

Incarceration questions test gestation, the sequence of treatment and the benign status of retroversion.

- **Trap:** treating acute retention in pregnancy as a simple urinary infection — **Correct:** at 12 to 14 weeks, retention with a retroverted uterus is incarceration, confirmed by bimanual examination.
- **Trap:** attempting manual reposition before catheterisation — **Correct:** empty the bladder first, which makes reposition easier and safer.
- **Trap:** blaming a mobile retroverted uterus for miscarriage — **Correct:** a mobile retroversion is a normal variant and is not itself a cause of miscarriage.

## Frequently asked questions

### When does uterine incarceration usually present?

Uterine incarceration usually presents at about 12 to 14 weeks of pregnancy, when the enlarging uterus rises out of the pelvis. A retroverted uterus impacted in the pelvis, often with adhesions, cannot rise. Acute urinary retention is the typical presentation.

### What is the first treatment for an incarcerated gravid uterus?

Catheterisation to empty the bladder is the first treatment for an incarcerated gravid uterus. Knee-chest position or bimanual reposition is then tried to bring the uterus forward. Laparoscopic release is reserved for repeated or failed reposition.

### Does retroversion cause miscarriage?

A mobile retroverted uterus is a normal variant and does not on its own cause miscarriage. Incarceration, by contrast, causes urinary retention and needs urgent treatment. Miscarriage risk should be assessed for its own causes.

### Why does incarceration cause urinary retention?

Incarceration causes urinary retention because the enlarged uterus pushes the cervix upward and forward behind the pubic symphysis, stretching and compressing the urethra and bladder neck. The bladder cannot empty as a result. Catheterisation relieves this and restores voiding.

### What is the complication of delayed catheterisation?

Delayed catheterisation can overdistend the bladder and cause detrusor damage, leading to long-term voiding problems. Prompt drainage prevents this. Women who had prolonged retention need follow-up of bladder function after delivery.