What Does A Collapsed Lung Look Like Signs Imaging?

A collapsed lung, medically known as pneumothorax, happens when air leaks into the space between your lung and your chest wall. That air pushes on the outside of the lung, causing it to partially or fully deflate like a punctured balloon. The signs can range from a sudden sharp chest pain and shortness of breath to a bluish tint on the skin in severe cases. On imaging, a collapsed lung shows up clearly on a chest X-ray as a visible line where the lung edge has pulled away from the chest wall, with a dark, air-filled gap in between.

What Does a Collapsed Lung Actually Look Like on the Outside?

You cannot see a collapsed lung with your eyes. The lung is inside the rib cage, so the physical appearance of the chest usually does not change. What you can see are the body’s visible reactions to the lung deflating.

The most telling outward signs are the symptoms a person displays. Someone with a collapsed lung often appears in visible distress. They may be breathing rapidly, clutching their chest, and struggling to catch their breath. Their skin can look pale, and in more serious cases, their lips or fingernails may take on a bluish or gray tint, which medical professionals call cyanosis. This indicates low oxygen levels in the blood and requires immediate emergency care.

In a condition called a tension pneumothorax, the pressure inside the chest builds up so much that it pushes the heart and windpipe to the opposite side. In this rare but life-threatening scenario, the neck veins may bulge visibly, and the person’s blood pressure can drop dangerously low, leading to shock. This is a medical emergency that requires immediate decompression.

What Does a Collapsed Lung Look Like on a Chest X-Ray?

The chest X-ray is the standard first test for diagnosing a collapsed lung. The image looks like a black-and-white photograph of your chest from the front. The ribs appear as white curved lines, the heart as a white mass in the center, and the lungs as dark areas on either side.

On a normal X-ray, the lungs look uniformly dark. In a collapsed lung, the doctor looks for a thin, white line that curves parallel to the chest wall. This is the edge of the deflated lung tissue. Between that line and the rib cage, there is a very dark, completely black area. That black space is the air that has leaked out of the lung and is trapped in the pleural space. The larger that black area appears, the more the lung has collapsed.

In a complete collapse, the lung may look like a small, dense white ball near the center of the chest, and the entire side of the chest cavity will appear black. In smaller collapses, the line may be subtle and only visible near the top of the lung, which is why doctors sometimes order an additional X-ray taken from the side or while you exhale to make the finding more obvious.

What Are the First Signs You Notice?

The most common first sign of a collapsed lung is sudden, sharp chest pain. This pain often feels worse when you take a deep breath, cough, or move. It is typically felt on one side of the chest and may radiate to the shoulder or back.

Shortness of breath is the second hallmark symptom. The severity of the breathlessness usually correlates with how much of the lung has collapsed. A small collapse may cause only mild breathlessness, while a large collapse can make it feel impossible to get enough air. Some people also experience a dry, hacking cough.

The speed of onset matters. Symptoms can appear suddenly with no warning, often during rest. In other cases, they develop gradually over several hours or days. If you experience these symptoms after a chest injury, a fall, or a medical procedure involving the chest, seek emergency care immediately.

What Does a Collapsed Lung Look Like on a CT Scan?

A CT scan provides a much more detailed image than a standard X-ray. It takes multiple cross-sectional images, like slices of the chest, and can detect even very small pneumothoraces that might be missed on an X-ray.

On a CT scan, the collapsed lung appears as a dense, solid structure within the chest cavity, clearly separated from the chest wall by a distinct pocket of air. The CT scan can also show the exact size of the collapse and help doctors identify the cause, such as a bleb, which is a small blister-like area on the lung that has ruptured.

Doctors typically order a CT scan when the X-ray is unclear, when the cause of the collapse is unknown, or when planning surgery to prevent a recurrence. It is the most accurate imaging method for this condition, but it is not always needed for an initial diagnosis.

How Do the Symptoms Compare to a Heart Attack?

Because a collapsed lung causes sudden chest pain and shortness of breath, it is often mistaken for a heart attack. Both are medical emergencies, and you should not try to diagnose yourself. Go to an emergency room.

There are some differences in the quality of the pain. Heart attack pain is often described as a pressure, squeezing, or fullness in the center of the chest that may spread to the arm, jaw, or back. Collapsed lung pain is typically sharp, stabbing, and localized to one side of the chest, and it worsens with breathing.

However, these distinctions are not reliable enough to act on. A person can have a heart attack with sharp pain, and a person can have a collapsed lung with pressure-like pain. Only an electrocardiogram (EKG), a chest X-ray, and blood tests can reliably tell the difference. If you are unsure, treat it as an emergency.

What Happens Inside the Chest During a Collapse?

To understand what a collapsed lung looks like, it helps to understand the anatomy. Your lungs are covered by a thin membrane called the visceral pleura. The inside of your chest wall is lined by another membrane called the parietal pleura. Between these two layers is the pleural space, which normally contains a tiny amount of fluid to lubricate movement.

When a pneumothorax occurs, air enters this pleural space. This can happen through a hole in the lung itself, such as a ruptured bleb, or through a hole in the chest wall, such as a puncture wound. Once air enters, it breaks the vacuum that normally keeps the lung inflated against the chest wall. The natural elasticity of the lung tissue then causes it to recoil and collapse inward.

The body cannot easily remove this trapped air. It may be slowly absorbed over time if the leak seals itself, but a large leak or a continuing leak will cause the lung to collapse further and further, potentially leading to respiratory failure if not treated.

Who Is Most at Risk for a Collapsed Lung?

Certain groups of people are more likely to experience a collapsed lung. Tall, thin young men between the ages of 20 and 40 are at the highest risk for a spontaneous pneumothorax, which occurs without any injury. This is often due to the rupture of tiny, weak spots on the lung called blebs.

People with underlying lung disease, such as chronic obstructive pulmonary disease (COPD), asthma, or cystic fibrosis, are also at increased risk. Smokers have a significantly higher risk than non-smokers. The risk also increases with age for people with chronic lung conditions.

Other risk factors include a family history of pneumothorax, a previous collapsed lung, and connective tissue disorders like Marfan syndrome. Traumatic causes include rib fractures, penetrating chest wounds, and complications from medical procedures such as a central line placement or a lung biopsy.

How Is a Collapsed Lung Treated?

Treatment depends entirely on the size of the collapse and the severity of symptoms. A small collapse with minimal symptoms may require no treatment other than observation. The body can often reabsorb the trapped air over several days, and the lung will re-expand on its own.

A larger collapse, or one causing significant breathing difficulty, requires intervention. The most common procedure is the insertion of a chest tube. This is a flexible plastic tube that the doctor inserts between the ribs into the pleural space. The tube is connected to a suction device that removes the trapped air, allowing the lung to re-expand. The tube typically stays in place for a few days until the leak heals.

For people who have had a collapsed lung more than once, surgery may be recommended. The goal of surgery is to seal the leak and prevent future collapses. This can be done with a minimally invasive procedure called video-assisted thoracoscopic surgery, or VATS, during which the surgeon removes the blebs and may perform a pleurodesis, which is a procedure that sticks the lung to the chest wall to eliminate the pleural space.