Q27.0 Congenital absence and hypoplasia of umbilical artery

Name of the Condition

• Congenital absence and hypoplasia of umbilical artery

Summary

Congenital absence and hypoplasia of the umbilical artery is a vascular anomaly present at birth, characterized by the partial or complete absence of one or both umbilical arteries. This condition may affect fetal blood flow and placental function, potentially leading to complications during pregnancy or delivery.

Causes

The exact cause is not fully understood, but it is believed to result from developmental abnormalities during embryonic vascular formation. Errors in the differentiation or regression of the vitelline arteries may contribute to the absence or underdevelopment of the umbilical artery.

Risk Factors

• Maternal Conditions: Certain maternal health issues, such as diabetes or hypertension, may increase risk.
• Genetic Factors: Rarely associated with chromosomal abnormalities or genetic syndromes.
• Environmental Influences: Prenatal exposure to teratogens or maternal nutritional deficiencies may play a role.

Symptoms

• Prenatal ultrasound may reveal a single umbilical artery (SUA) or absent umbilical artery.
• Potential association with intrauterine growth restriction (IUGR) or other congenital anomalies.
• Postnatal findings may include abnormal placental morphology or vascular insufficiency.

Diagnosis

Diagnosis is typically made via prenatal ultrasound, which can detect the absence or hypoplasia of the umbilical artery. Postnatal confirmation may involve physical examination, Doppler ultrasound, or placental pathology to assess vascular structure.

Treatment Options

• Monitoring: For asymptomatic cases, regular prenatal monitoring is often sufficient.
• Management of Complications: If associated with IUGR or other issues, interventions may include fetal surveillance, delivery planning, or neonatal care.
• Surgical Intervention: Rarely required, unless complications like vascular insufficiency arise.

Prognosis and Follow-Up

Prognosis depends on associated anomalies or complications. Most cases with isolated absence/hypoplasia have a favorable outcome, but follow-up may be needed to monitor for long-term vascular or developmental issues.

Complications

• Increased risk of intrauterine growth restriction (IUGR).
• Potential for preterm delivery or placental insufficiency.
• Rarely, associated congenital anomalies affecting other systems.

Lifestyle & Prevention

• Prenatal care, including folic acid supplementation, may support fetal development.
• Avoidance of teratogens (e.g., alcohol, certain medications) during pregnancy is recommended.
• Genetic counseling may be advised for families with a history of similar conditions.

When to Seek Professional Help

• If prenatal ultrasound suggests abnormal umbilical artery development.
• If there are signs of fetal distress or growth abnormalities.
• For postnatal evaluation if vascular or developmental concerns arise.

Tips for Medical Coders

• Code Q27.0 is used for congenital absence or hypoplasia of the umbilical artery. Documentation should specify whether the condition is unilateral or bilateral and note any associated complications or anomalies. Ensure clear differentiation from acquired vascular issues.