Symptoms, Diagnosis, and Preventing Misdiagnosis in CLE

Diagnosing Congenital Lobar Emphysema (CLE) can be a complex journey. Because it is rare and shares features with other conditions, it is often missed before birth and may be confused with more common respiratory issues after birth ^[1][2]. Understanding the diagnostic process can help you ensure your child receives the correct care.

The Prenatal “Blind Spot”

Many parents are surprised that CLE was not caught during pregnancy ultrasounds. While other lung malformations are often detected prenatally, CLE is rarely visible before birth ^[1][3]. When it is caught prenatally, it appears as a fluid-filled mass rather than an air-filled one ^[4]. This is because, in the womb, the lungs are filled with fluid. The “one-way valve” effect that characterizes CLE only begins once the baby starts breathing air, causing the overinflation to typically become visible on scans only after birth ^[4].

Recognizing Respiratory Distress

Most babies with CLE show symptoms shortly after birth, though some may not show signs for weeks or months ^[1][5]. You should watch for physical signs of respiratory distress (struggling to breathe), which include:

• Tachypnea: Very fast breathing ^[6].
• Nasal Flaring: The nostrils widening with every breath.
• Retractions: The skin pulling in around the ribs or neck during breathing ^[7].
• Grunting: A short, deep sound made when the baby exhales.
• Cyanosis: A bluish tint to the skin, lips, or fingernails, indicating low oxygen levels.
• Wheezing or Coughing: Persistent sounds that do not go away with standard treatments ^[6][8].
• Feeding Difficulties: Because breathing and swallowing are closely linked, infants with CLE often struggle to finish feeds, tire easily during feeding, or pause frequently to catch their breath ^[9].

Preventing Misdiagnosis: The Great Mimic

CLE is frequently mistaken for other conditions because they can look similar on a standard chest X-ray. It is vital to distinguish CLE from:

• Pneumothorax (Collapsed Lung): This is the most common misdiagnosis ^[2]. In a pneumothorax, air is trapped outside the lung in the chest cavity. In CLE, air is trapped inside the lung lobe. A key difference is that CLE will still show faint lung markings (blood vessels) on an X-ray, whereas a pneumothorax looks like a completely empty black space ^[2][10].
• CPAM (Congenital Pulmonary Airway Malformation): These are lung cysts. While CLE involves overinflated normal tissue, CPAM involves the growth of abnormal, non-functional cystic tissue ^[11][3].
• Foreign Body Aspiration: If an older infant suddenly develops symptoms, doctors may think they choked on an object. Both cause “air trapping,” but CLE is a structural issue from birth ^[12][8].

The Gold Standard: Contrast-Enhanced CT

While an X-ray is usually the first step, a contrast-enhanced CT scan is the definitive tool for diagnosis ^[9][6]. The “contrast” is a special dye that highlights blood vessels. This is crucial because it allows doctors to see if the airway is being compressed from the outside by an abnormal blood vessel (like a pulmonary artery sling) or if the issue is inside the airway itself ^[13][14].

Note: Because the baby must remain perfectly still for the CT scan, they will likely be given mild sedation or briefly placed under general anesthesia. This is standard procedure and ensures the images are clear enough to make an accurate diagnosis ^[9].

Diagnostic Report Checklist

When you receive your child’s imaging report, look for these specific details to discuss with your specialist:

• Lobe Involvement: Confirmation of which lobe is affected (most commonly the Left Upper Lobe) ^[1].
• Mediastinal Shift: Mention of whether the heart or windpipe is being pushed to the opposite side of the chest ^[15][2].
• Vascular Anatomy: A description of the surrounding blood vessels to rule out external pressure on the airway ^[13].
• Lung Markings: Confirmation that lung tissue is present within the overinflated area (helping to rule out a pneumothorax) ^[2].
• Atelectasis: Whether the overinflated lobe is squishing the healthy parts of the lung ^[15].