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Bladder Fistulas – Causes, Symptoms and Treatment

Bladder fistulas are abnormal connections between the urinary bladder and neighboring organs. They cause symptoms such as urinary tract infections or uncontrolled urine leakage and usually require surgical treatment.

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Things worth knowing about "Bladder Fistulas"

Bladder fistulas are abnormal connections between the urinary bladder and neighboring organs. They cause symptoms such as urinary tract infections or uncontrolled urine leakage and usually require surgical treatment.

What Are Bladder Fistulas?

A bladder fistula (also called a urinary bladder fistula) is an abnormal, tunnel-like connection between the urinary bladder and an adjacent organ or the body surface. These connections do not occur naturally but develop as a result of disease, injury, or surgical procedures. Through this channel, urine can leak uncontrollably into surrounding structures, causing significant discomfort and health complications.

Types of Bladder Fistulas

Bladder fistulas are classified based on which organ is connected to the bladder:

Vesicovaginal fistula: A connection between the bladder and the vagina – the most common type in women.
Colovesical fistula (vesicointestinal fistula): A connection between the bladder and the colon.
Vesicouterine fistula: A connection between the bladder and the uterus.
Vesicorectal fistula: A connection between the bladder and the rectum.
Cutaneous bladder fistula: A connection between the bladder and the skin surface.

Causes

Bladder fistulas can arise from various underlying conditions:

Surgery: Gynecological, intestinal, or urological procedures may inadvertently injure the bladder wall.
Childbirth: Prolonged or difficult labor can cause tissue damage that promotes fistula formation.
Inflammatory bowel disease: Conditions such as Crohn disease or diverticulitis can erode surrounding tissue, leading to fistulas.
Tumors: Malignant diseases of the bladder, bowel, or female reproductive organs may grow into adjacent structures.
Radiation therapy: Pelvic radiation can damage tissue and lead to fistula development.
Trauma: Injuries from accidents or external forces may cause abnormal connections.

Symptoms

Symptoms depend on the organs involved:

Vesicovaginal fistula: Continuous, involuntary leakage of urine through the vagina without any urge to urinate.
Colovesical fistula: Air or fecal matter in the urine (pneumaturia or fecaluria), frequent urinary tract infections, and foul-smelling or cloudy urine.
General symptoms: Recurrent urinary tract infections, lower abdominal pain, and fever in cases of infection.

Diagnosis

Several diagnostic methods are used to confirm a bladder fistula:

Cystoscopy: Direct visualization of the bladder wall using an endoscope – the most important diagnostic tool.
Imaging: Computed tomography (CT) or magnetic resonance imaging (MRI) of the pelvis to precisely locate the fistula.
Cystography: X-ray examination of the bladder using contrast dye.
Laboratory tests: Urine analysis to detect bacteria, signs of inflammation, or fecal content.
Dye test: Instillation of a colored dye into the bladder or vagina to visualize the fistula tract.

Treatment

Treatment depends on the cause, location, and extent of the fistula.

Conservative Management

In rare cases – particularly with small, recently formed fistulas – continuous bladder catheterization may be sufficient to reduce pressure on the bladder wall and allow spontaneous healing. Concurrent urinary tract infections are treated with antibiotics.

Surgical Treatment

In most cases, surgical intervention is required. The fistula tract is excised, affected tissue is removed, and both the bladder wall and the neighboring organ are carefully closed. Depending on the location of the fistula, this can be performed minimally invasively (laparoscopically) or as open surgery. When an underlying condition such as Crohn disease or a tumor is present, the primary disease must also be treated.

Follow-Up Care

After surgery, regular urological check-ups are important to monitor healing and detect any recurrence at an early stage.

Prognosis

The outlook following successful surgical repair of a bladder fistula is generally favorable. However, treating the underlying cause is essential for long-term success. In cases related to tumors or radiation damage, the prognosis may be more limited.

References

Wein, A. J., Kavoussi, L. R., Partin, A. W. & Peters, C. A. – Campbell-Walsh Urology. Elsevier, 11th edition (2016).
World Health Organization (WHO) – Obstetric Fistula. Fact Sheet. Available at: www.who.int
Melchior, S. et al. – Diagnosis and Surgical Management of Colovesical Fistulas. Journal of Urology, PubMed. Available at: www.ncbi.nlm.nih.gov/pubmed

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