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Rigid chest

Question
Why does the rib cage becomes rigid with the years when one has cystic fibrosis?
Answer
Hello,
The lung that is permanently inflamed causes a distension of the rib cage.
To breathe better, the supplementary inspiratory muscles work permanently.
This leads to stiffening of the rib cage.
I hope to have answered your question.
Charlotte Lacarriere
16.01.2017