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Sometimes it’s tricky to differentiate emphysema from pulmonary Langerhans cell histiocytosis (PLCH). Here are two different patients—both heavy smokers: •Case 1: 82-year-old male •Case 2: 31-year-old male One has PLCH. Which one do you think it is? And how do you distinguish confluent centrilobular emphysema (CLE) from pulmonary Langerhans... show more
10,646 views • 1 year ago •via X (Twitter)
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the age of the patients favor case 1 emphysema and case 2 PLCH.

You’re absolutely right—the age does favor emphysema in Case 1 and PLCH in Case 2. But my aim here is to highlight the imaging clues that help differentiate between the two.

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1) emphysema 2) PLCH Usefull clues: Cysts should have a thin wall (not always easy); search for coexistance of nodules in PLCH; in emphysema there shpuld be an artery in the center; All that being said, in some cases differentiation is not as easy as it sounds…

LCH never at CP angles CLE mid basal predominant

In CLE there is an artery tha runs through its center Another clue to differentiate between them is to search the coexistance of nodules wich will favour Plch

Thank you for your insightful contribution.

No 2 is PLCH, we can see the wall of the cyst on the CT

You’re right—perceptible cyst walls are a clue in PLCH. But in confluent centrilobular emphysema, compressed parenchyma can also make walls appear perceptible. What other features can help us tell them apart?

Differentiating between emphysema and PLCH can indeed be challenging, especially given shared risk factors like smoking. Typically, PLCH is more common in younger patients and is often characterized by nodular and cystic changes in the lungs. Given the age of the patients, the 31-year-old male might more likely have PLCH but confirmation requires imaging and possibly histological analysis. What distinguishing factors do you look for in imaging to differentiate between these conditions? For comprehensive insights and further review articles on such nuanced topics, check out a dynamic resource for building and accessing biomedical content. #Medicine Support Medical Doctors in Uganda: Help by sharing this GoFundMe! 🙏 ❤️ →

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Thank you for following this case—I hope you found the answer helpful!
