A 15-year-old boy in Tokyo finished a choir class with a pain in the front of his chest that would not let up. It got worse every time he breathed in. He was not coughing. He was not short of breath. He had not vomited. His vital signs were normal, his breath sounds were normal, and nothing about his chest wall looked wrong on examination.
By the time doctors finished imaging him, they had found air where air is not supposed to be: inside the mediastinum, the compartment in the middle of the chest that holds the heart, the great vessels, and the esophagus. Some of it had also tracked up into the soft tissue of his neck.
Emergency and critical care physicians at Kawakita General Hospital published the case in Oxford Medical Case Reports. They diagnosed idiopathic pneumomediastinum, the condition more commonly called spontaneous pneumomediastinum, and concluded that the sudden rise in pressure inside his chest during singing was the likely trigger.
Chest Pain That Got Worse with Every Breath In
The boy was tall and lean, the build most often described in reports of this condition. Anterior chest pain that intensifies on inspiration was the only symptom he reported, and it overlaps with a long list of far more common and far more benign causes in teenagers. That is part of what makes the case instructive rather than merely strange.
Chest computed tomography confirmed mediastinal emphysema running from the pericardium up into the neck. There was no pneumothorax, meaning no collapsed lung. He was managed conservatively, without a drain or surgery. Follow-up imaging on day 10 showed the air had almost entirely resolved.
The Asthma Detail That Explains Why Singing Was Enough
Singing hard does raise pressure inside the chest. On its own, in a healthy adolescent, that is usually not enough to rupture anything.
The boy had a history of bronchial asthma, and that is the piece doing most of the mechanical work. Asthma causes air trapping, which leaves alveoli overdistended and vulnerable to rupture during forceful expiration. Once an alveolus tears, air travels along the sheaths surrounding the bronchi and blood vessels and collects in the mediastinum. That pathway is known as the Macklin effect, described in a review in the World Journal of Radiology.
The authors are careful about how they assign roles. Asthma supplied the predisposition. Singing supplied the trigger. They also cite work indicating that asthma can predispose to pneumomediastinum regardless of whether the patient is having an acute flare.
This is the point where it is worth stating plainly what the case does not mean. Singing is not a health risk for the general public, and the report does not suggest otherwise. The condition remains rare, though it is not unheard of in people who use their lungs hard: emergency physicians have described a similar episode in an 18-year-old baritone player after marching band practice. A narrative review in the Journal of Thoracic Disease calls primary spontaneous pneumomediastinum a poorly understood and resource-intensive problem.
The Textbook Signs Radiologists Look For Were Not There
The reason the authors chose to publish is not the choir class. It is the imaging.
Two findings are taught as hallmarks of pneumomediastinum on a plain chest radiograph. The continuous diaphragm sign appears when air outlines the whole diaphragm across the midline. Naclerio's V sign appears when air traces a V shape along the left border of the descending aorta and the diaphragm. Neither was clearly present in this boy's film.
What was visible instead was subtler: a contour line running from the main pulmonary artery toward the left ventricle, produced by the visceral and parietal pleura being separated by gas, plus a thin lucency alongside the left side of the descending aorta, and emphysema in the neck.
The conclusion the team draws is a warning about pattern matching. When mediastinal emphysema is clinically suspected, they write, clinicians should obtain chest imaging to look for fine linear lucencies outlining the mediastinum and great vessels, rather than waiting for classic signs before taking the diagnosis seriously.
Ten Days of Doing Almost Nothing
Treatment consisted largely of observation. That is typical. Most cases resolve on their own as the trapped air is gradually reabsorbed, and the boy's follow-up radiograph on day 10 showed near-complete resolution. Conservative management is also the norm in previously healthy children who present this way, though many are admitted and worked up carefully first, because the differential includes esophageal rupture and other conditions that are not benign at all.
A few caveats belong on this story. This is a single patient, published as a clinical image rather than a full case report, so the level of detail is limited by design. The authors received no funding, declared no conflicts of interest, and obtained consent from the boy's guardian. It is also a Japanese case, and it says nothing about how often this happens in the United States.
What it does offer is a reminder that persistent chest pain in an adolescent after strenuous exertion, singing included, deserves an actual evaluation rather than reassurance over the phone, particularly in a teenager with asthma. Anyone with sudden or severe chest pain, breathlessness, or swelling and crackling under the skin of the neck should seek medical attention.
Key Questions Answered
What is pneumomediastinum? It is the presence of air in the mediastinum, the central compartment of the chest containing the heart, major blood vessels, and esophagus. Air usually arrives there after alveoli in the lungs rupture.
How did singing cause it? Singing raises pressure inside the chest. In this patient, underlying asthma had left his airways prone to air trapping and alveolar rupture, so the pressure spike was enough to force air out along the bronchovascular sheaths.
Is this a reason to avoid singing? No. The condition is rare, and the report describes a teenager with a specific predisposing lung condition. Nothing in it suggests singing is risky for the general public.
What were the symptoms? Persistent pain in the front of the chest that worsened on breathing in. He had no cough, no breathlessness, and no vomiting, and his vital signs and breath sounds were normal.
Why do the authors say the X-ray was misleading? The two classic radiographic signs of pneumomediastinum were not clearly visible. Only subtler linear lucencies around the mediastinum and great vessels, plus neck emphysema, pointed to the diagnosis.
How was it treated? Conservatively, without surgery or a chest drain. Repeat imaging on day 10 showed the air had nearly resolved on its own.
