Dozens: Pneumonia (inflammation of lungs) may be due to non-infectious conditions including medications, collogen-vascular disease, conditions like sarcoidosis, etc. It can also be caused by bacteria, viruses, fungus, parasites. It can occur by aspiration of material from above, extension thru the blood stream, by direct penetration or extension from adjacent structures. Complex subject.
Answered 6/24/2013
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