A case of obstructed labour which was delivered by caesarian section complains of cyclical passage of menstrual blood in urine. Which is the most likely site of fistula?
**Core Concept**
The case describes a patient with a vesicovaginal fistula, a type of urinary incontinence due to an abnormal connection between the bladder and the vagina. This condition often occurs as a complication of obstructed labor, where prolonged pressure on the bladder and vagina can cause tissue damage and fistula formation.
**Why the Correct Answer is Right**
The patient's complaint of cyclical passage of menstrual blood in urine indicates that urine is leaking into the vagina, carrying menstrual blood with it. This is a classic symptom of a vesicovaginal fistula. The fistula likely formed during the caesarian section, where surgical trauma to the bladder and vagina led to tissue damage and fistula creation. The bladder and vagina share a common wall, and surgical incisions or trauma in this area can lead to fistula formation.
**Why Each Wrong Option is Incorrect**
**Option A:** Ureterovaginal fistula - This type of fistula involves an abnormal connection between the ureter and the vagina, typically causing continuous urine leakage rather than cyclical passage of menstrual blood.
**Option B:** Rectovaginal fistula - This type of fistula involves an abnormal connection between the rectum and the vagina, typically causing fecal incontinence rather than urinary incontinence.
**Option C:** Vesicouterine fistula - This type of fistula involves an abnormal connection between the bladder and the uterus, typically causing urine leakage into the uterine cavity.
**Clinical Pearl / High-Yield Fact**
Vesicovaginal fistulas are more common in developing countries due to limited access to medical care and increased incidence of obstructed labor. Prompt diagnosis and treatment are essential to prevent chronic urinary incontinence and associated complications.
**Correct Answer:** C.