Less common disorders:I
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| DISEASE AND CAUSES | PATHOPHYSIOLOGY | SIGNS AND SYMPTOMS |
| Idiopathic pulmonary fibrosis | ||
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Interstitial inflammation consists of an alveolar septal infiltrate of lymphocytes, plasma cells, and histiocytes. Fibrotic areas are composed of dense acellular collagen. Areas of honeycombing that form are composed of cystic fibrotic air spaces, frequently lined with bronchiolar epithelium and filled with mucus. Smooth muscle hyperplasia may occur in areas of fibrosis and honeycombing. |
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| Irritable bowel syndrome | ||
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Altered neural stimulation results in nonpropulsive segmentation waves, leading to constipation. |
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