Neonatal left lung agenesis presenting as pneumonia in a resource-limited setting: a case report
This case report describes a term neonate in a resource-limited setting whose left lung agenesis was initially misdiagnosed as pneumonia, highlighting the critical need for clinicians to consider this rare congenital anomaly in infants with persistent respiratory distress and asymmetric chest findings to ensure timely diagnosis and appropriate management.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Imagine your body as a bustling city where every organ is a vital neighborhood. The lungs are the city's air filtration plants, usually coming in a matching pair—one on the left, one on the right—working together to keep the whole place breathing easy. Sometimes, however, a construction crew makes a mistake while the city is still being built. A "lung bud," which is supposed to grow into a full lung, simply forgets to show up. This rare event is called pulmonary agenesis. It's like showing up to a house with only one room when the blueprint called for two; the rest of the house has to work overtime to compensate.
When this happens in a newborn, the single working lung has to do all the heavy lifting, often leading to a struggle for breath that looks a lot like a common cold or pneumonia. In places where high-tech medical tools are scarce, doctors might treat the symptoms they see (like a fever or cough) without realizing the root cause is a missing organ. This paper dives into a specific, tricky case from Ethiopia to show how easy it is to miss this hidden structural problem and why spotting it early changes everything for the baby's future.
The Case of the Missing Left Lung
This story begins with a baby girl born in Addis Ababa, Ethiopia. She was a full-term infant, weighing 2.5 kg, but the moment she took her first breaths, things went sideways. She needed help with a bag-mask for five minutes just to get her lungs moving. A week later, she was breathing fast and was sent to a local health center. The doctors there saw high white blood cell counts and a high C-reactive protein (CRP) level of 147 mg/L, along with a feverish appearance. They did what any good doctor would do: they treated her for neonatal pneumonia, assuming her lungs were infected.
But here's the twist: the pneumonia treatment didn't work. In fact, the baby got worse. Her breathing became more labored, and she needed more and more oxygen. She was referred to a big, tertiary hospital where the real mystery was about to be solved.
The Detective Work
When the team at the big hospital looked at her, they saw something that didn't quite fit the "pneumonia" picture. While pneumonia usually shows up as patchy spots on a lung X-ray, this baby's left side was completely dark and empty. It was as if the entire left side of her chest was a solid block of shadow. Her ribs on that side were crowded together, and her heart and other organs had been pushed over to the left to fill the empty space. The right lung, meanwhile, was stretched out and over-inflated, trying to do the job of two lungs.
To be absolutely sure, they used a contrast-enhanced chest CT scan (a super-detailed 3D picture of the inside of the body). The scan confirmed the scary truth: she had left lung agenesis. She didn't just have a bad infection; she was born without a left lung, a left main bronchus (the air tube), and even a left pulmonary artery (the blood vessel). It was a complete absence of the entire left-side infrastructure.
The Heart's Struggle
The missing lung didn't just affect breathing; it put a massive strain on her heart. Because the left lung was gone, the blood had nowhere to go but through the right side, causing the right heart chambers to swell up like overfilled balloons. She also had a moderate patent ductus arteriosus (PDA)—a hole between two major blood vessels that was supposed to close before birth but stayed open, measuring 2.5 mm. This hole was letting blood flow backward and forward, making the heart work even harder. The pressure in her lung arteries (pulmonary hypertension) was severe.
The Treatment and the Outcome
Since you can't grow a new lung, the doctors had to be creative with what she had. They put her on Continuous Positive Airway Pressure (CPAP), which is like a gentle, constant breeze that keeps her single lung open and working without the harsh force of a mechanical ventilator. They also gave her a cocktail of medicines: sildenafil to relax the blood vessels in her lungs, and a mix of furosemide, hydrochlorothiazide, and spironolactone to help her body get rid of extra fluid and reduce the heart's workload.
The baby slowly turned the corner. She was discharged at two months old, but she still needed a little help breathing, using 1 L/min of oxygen through a nasal tube. By the time she was six months old, she was still dependent on that oxygen. A follow-up heart scan showed the situation had actually gotten a bit more complex: her heart chambers were even more dilated, and the PDA had grown larger, now measuring 6–7 mm.
What This Means
This paper isn't just a story about one baby; it's a warning sign for doctors everywhere, especially in places with fewer resources. The main finding is that lung agenesis is often hidden behind the mask of common pneumonia. Because the baby had signs of infection (high white blood cells and CRP), the doctors at the first clinic treated the infection but missed the missing organ. The paper argues that if a child has breathing trouble that doesn't get better with standard pneumonia treatment, or if their chest looks weirdly uneven (like one side being empty), doctors need to think about rare birth defects, not just infections.
The authors are careful to say that while they found this specific case, it's just one story, so we can't say this happens to everyone. They also note that because they are in a resource-limited setting, they couldn't do advanced heart surgeries or catheter procedures that might have fixed the PDA. Instead, they had to rely on medicine and supportive care.
In the end, this case teaches us that sometimes, when a baby is struggling to breathe, the problem isn't a bug (like a virus or bacteria) but a missing blueprint. Recognizing that the left side of the chest is empty, rather than just "sick," is the key to giving these kids the right kind of care.
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