Q79.4 Prune belly syndrome

Name of the Condition

• Prune belly syndrome

Summary

Prune belly syndrome is a rare congenital disorder characterized by a triad of abnormalities: deficient abdominal wall musculature, urinary tract dilation, and undescended testes in males. The condition results in a wrinkled, prune-like appearance of the abdomen due to the lack of muscle tone. It primarily affects males and may involve renal, pulmonary, or gastrointestinal complications.

Causes

The exact cause of prune belly syndrome is not fully understood, but it is thought to arise from impaired development of the abdominal wall, urinary tract, and testes during fetal growth. Genetic factors may play a role, though most cases occur sporadically. The syndrome is associated with urinary tract obstruction or dysfunction, which contributes to the characteristic abdominal and renal abnormalities.

Risk Factors

• Male sex (nearly exclusive occurrence).
• Family history of congenital urinary or abdominal wall defects.
• Maternal exposure to certain teratogens during pregnancy.
• Chromosomal abnormalities in some cases.

Symptoms

• Abdominal wall laxity or wrinkling (prune-like appearance).
• Bilateral undescended testes in males.
• Urinary tract dilation (hydronephrosis, hydroureter, bladder distension).
• Possible respiratory or gastrointestinal issues due to abdominal pressure.

Diagnosis

Diagnosis is typically made prenatally via ultrasound, which may reveal abdominal wall defects, urinary tract dilation, or undescended testes. Postnatal evaluation includes physical examination, imaging (e.g., ultrasound, MRI) to assess renal and urinary tract structure, and genetic testing if chromosomal abnormalities are suspected.

Treatment Options

Treatment focuses on managing complications and may include surgical repair of the abdominal wall, urinary tract reconstruction, or orchiopexy for undescended testes. Supportive care addresses renal function, respiratory issues, or gastrointestinal problems. Multidisciplinary care involving urology, nephrology, and surgery is often required.

Prognosis and Follow-Up

Prognosis varies depending on the severity of renal and pulmonary involvement. Early intervention improves outcomes, but long-term monitoring for renal function, urinary tract health, and developmental milestones is essential. Regular follow-up with specialists is recommended to address potential complications.

Complications

• Renal dysfunction or failure due to urinary tract obstruction.
• Respiratory issues from abdominal wall weakness or pulmonary hypoplasia.
• Gastrointestinal problems, such as feeding difficulties or constipation.
• Increased risk of urinary tract infections or bladder dysfunction.

Lifestyle & Prevention

No specific preventive measures exist, as the condition is congenital. Prenatal care, including avoiding teratogens and managing maternal health, may reduce risk. Postnatal care focuses on supportive management and addressing associated complications.

When to Seek Professional Help

Seek medical attention if a newborn exhibits abdominal wall abnormalities, urinary tract symptoms, or signs of respiratory distress. Early evaluation is critical for diagnosing and managing potential complications.

Tips for Medical Coders

Document the presence of the triad (abdominal wall deficiency, urinary tract dilation, undescended testes) and any associated complications. Ensure coding aligns with clinical findings, as prune belly syndrome may require additional codes for renal or urinary tract involvement. Verify documentation supports the diagnosis and any related procedures or evaluations.