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| ==Pulmonary hemorrhage== | | ==Pulmonary hemorrhage== |
| ===General===
| | {{Main|Pulmonary hemorrhage}} |
| *Many causes.
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| A few causes:
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| *Trauma.
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| *Acute [[bronchopneumonia]].
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| *Lung cancer, e.g. [[lung adenocarcinoma]].
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| *[[Pulmonary hypertension]].
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| *Infection, e.g. [[tuberculosis]].
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| *[[Bronchiectasis]].
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| Pulmonary hemorrhage syndromes:<ref name=Ref_PBoD745>{{Ref PBoD|745}}</ref>
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| *[[Goodpasture syndrome]].
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| *[[Idiopathic pulmonary hemosiderosis]].
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| *Vasculitis-associated hemorrhage (hypersensitivity angiitis, [[Wegener's granulomatosis]]).
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| *[[Systemic lupus erythematosus]].
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| ===Radiology===
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| *Airspace opacity.
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| ===Microscopic===
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| Features:
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| *[[Red blood cell]]s in the airspaces - abundant.
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| *+/-Siderophages (hemosiderin-laden macrophages).
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| **Can count (distinct) granules (unlike in ''[[smoker's macrophages]]'').
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| DDx:
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| *Decomposition.
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| ==Constrictive bronchiolitis== | | ==Constrictive bronchiolitis== |