Congenital lung malformations

Congenital Lung Malformations

Congenital lung malformations (CLMs) are a group of rare, non-cancerous abnormalities that develop during fetal lung formation. These conditions affect the structure, function, or tissue composition of the lungs and may impact breathing shortly after birth or later in childhood. Common types include:

• Congenital pulmonary airway malformation (CPAM)
• Bronchopulmonary sequestration (BPS)
• Congenital lobar emphysema (CLE)
• Bronchogenic cysts

Some malformations are detected before birth via prenatal imaging, while others are found during infancy or childhood due to respiratory symptoms or incidental imaging. In many cases, surgical evaluation is necessary, especially if there is risk of infection, compression of normal lung tissue, or breathing difficulty.

Types of Congenital Lung Malformations

Congenital Pulmonary Airway Malformation (CPAM)

Previously called CCAM, this is a cystic or solid mass of abnormal lung tissue that doesn’t function properly and may enlarge or become infected.

Bronchopulmonary Sequestration (BPS)

This refers to lung tissue that develops without normal airway or blood supply connections, making it non-functional. It can become infected or cause mass effect.

Congenital Lobar Emphysema (CLE)

CLE results in over-inflation of one lobe of the lung, which can compress surrounding lung tissue and interfere with breathing.

Bronchogenic Cysts

These are fluid-filled sacs typically located near the airways or esophagus. They may cause airway compression or infection.

Signs and Symptoms

CLMs vary widely in presentation. Symptoms may appear shortly after birth, or not until later in infancy or early childhood. Common signs include:

• Rapid or labored breathing
• Recurrent respiratory infections
• Wheezing or persistent cough
• Cyanosis (bluish skin)
• Feeding difficulties in infants
• Chest mass found on imaging

Some babies are completely asymptomatic at birth and are monitored until intervention is necessary.

Diagnosis

Many CLMs are diagnosed prenatally through routine ultrasound and further evaluated with fetal MRI. After birth, diagnosis may involve:

• Chest X-ray
• CT scan or MRI
• Echocardiogram to rule out associated heart conditions
• Bronchoscopy in select cases to evaluate airway anatomy

Diagnostic imaging helps determine the type, size, location, and impact of the malformation.

Treatment and Surgical Options

Treatment depends on the type and severity of the malformation:

• Observation — asymptomatic infants may be monitored with regular imaging and follow-up
• Elective surgery — often recommended to remove abnormal lung tissue before complications occur
• Emergency surgery — in newborns with severe symptoms, immediate intervention may be necessary

Surgery typically involves a lobectomy, the removal of the affected lobe of the lung. Pediatric surgeons often perform these procedures using minimally invasive techniques when possible.