Difference between revisions of "Pneumonia"
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*[http://commons.wikimedia.org/wiki/File:Aspiration_pneumonia_%282%29.jpg Aspiration pneumonia - 2 - (WC)]. | *[http://commons.wikimedia.org/wiki/File:Aspiration_pneumonia_%282%29.jpg Aspiration pneumonia - 2 - (WC)]. | ||
*[http://commons.wikimedia.org/wiki/File:Aspiration_pneumonia_%283%29.jpg Aspiration pneumonia - 3 - (WC)]. | *[http://commons.wikimedia.org/wiki/File:Aspiration_pneumonia_%283%29.jpg Aspiration pneumonia - 3 - (WC)]. | ||
==Cytomegalovirus pneumonia== | |||
{{Main|Cytomegalovirus}} | |||
===General=== | |||
*Immunodeficiency. | |||
*Critical illness.<ref name=pmid20931610>{{Cite journal | last1 = Limaye | first1 = AP. | last2 = Boeckh | first2 = M. | title = CMV in critically ill patients: pathogen or bystander? | journal = Rev Med Virol | volume = 20 | issue = 6 | pages = 372-9 | month = Nov | year = 2010 | doi = 10.1002/rmv.664 | PMID = 20931610 }}</ref> | |||
===Microscopic=== | |||
Features: | |||
*CMV nuclear changes: | |||
**Large red nucleus with a pale halo. | |||
*Eosinophilic granular cytoplasmic inclusions. | |||
Images: | |||
*[http://www.pathologyoutlines.com/images/lungcmv2.jpg CMV pneumonia (pathologyoutlines.com)].<ref>URL: [http://www.pathologyoutlines.com/topic/lungnontumorCMV.html http://www.pathologyoutlines.com/topic/lungnontumorCMV.html]. Accessed on: 23 January 2012.</ref> | |||
*[http://www.pathology.washington.edu/about/education/gallery/infections/Aspergillus_d_ppt.jpg CMV pneumonia (washington.edu)]. | |||
*[http://www.art.com/products/p360692202-sa-i4008999/frederick-skvara-cytomegalovirus-cmv-pneumonitis-in-the-lung-h-e-stain.htm?sorig=cat&sorigid=177507&dimvals=177507-207238&ui=e5fd37a28e3048d8af7d3285d9b9cdfa CMV pneumonia (art.com)]. | |||
===IHC=== | |||
*CMV +ve -- cytoplasmic inclusions, large nucleus. | |||
=Diffuse lung diseases= | =Diffuse lung diseases= | ||
Revision as of 23:13, 23 January 2012
Pneumonia is inflammation of the lung and grouped with the medical lung diseases.
There are various types of pneumonia.
Infectious pnemonia
Anatomical classification of pneumonia
- Generally, not used by clinicians.
- Use of the terms without qualification is discouraged... as they do not make explicit the etiology.
Bronchopneumonia
- Multiple foci of (acute) inflammation involving the bronchi.
- This is the most common form of (infectious) pneumonia.
Lobar pneumonia
- Pneumonia that involves a whole lobe.
- Rarely seen in areas where antibiotic treatments are widely available.
Acute infectious pneumonia
General
- This is seen by pathologists, in autopsy, from time-to-time.
Most common cause:
- Streptococcus pneumoniae.[1]
The top three community acquired (acute) pneumonia:[2]
- Streptococcuc pneumonia.
- Haemophilus influenzae.
- Moraxella catarrhalis.
Other community acquired pneumonia:[1]
- S. aureus.
- Legionaella pneumophila.
- Klebsiella pneumoniae.
- Pseudomonas.
Hospital-acquired pneumonia:[1]
- Gram-negative rods.
- Staphylococcus aureus.
Radiologic correlate
- Air space disease.
Gross pathology
- Consolidation (the lung parenchyma is firm) - best appreciated by running a finger over the cut surface of the lung with a small-to-moderate amount of pressure.
Microscopic
Features:
- Alveoli packed with PMNs.
- +/-Clusters of bacteria - small dots or rods.
Image: Normal alveoli & pneumonia (WC).
Stains
- Gram stain -- to type the bacteria.
Chronic infectious pneumonia
General
Common microorganisms:[1]
- Nocardia.
- Actinomyces.
- Mycobacterium tuberculosis.
- Atypical mycobacterium, e.g. Mycobacterium avium-intracellulare.
- Histoplasma capsulatum.
- Coccidioides immitis.
- Blastomyces dermatitidis.
Note:
- All of the later ones are granulomatous.
Microscopic
Features:
- Inflammation.
- +/-Granulomas.
Aspiration pneumonia
General
- Usually seen in the context of a toxin and/or pathology that affects the swallowing and cough reflexes.[3]
- Stroke.
- Multiple sclerosis.
- Alcohol.
- The microorganisms involved are usually different than in other causes of acute pneumonia.
Gross
- More common in the right lung.
- Right main stem bronchus is more vertical.
Microscopic
Features:
- +/-Foreign body giant cells.
- Microorganisms.
Images:
Cytomegalovirus pneumonia
Main article: Cytomegalovirus
General
- Immunodeficiency.
- Critical illness.[4]
Microscopic
Features:
- CMV nuclear changes:
- Large red nucleus with a pale halo.
- Eosinophilic granular cytoplasmic inclusions.
Images:
IHC
- CMV +ve -- cytoplasmic inclusions, large nucleus.
Diffuse lung diseases
Main article: Diffuse lung disease
- AKA idiopathic interstitial pneumonia.
Histologic pattern:
- Organizing pneumonia.
- Usual interstitial pneumonia.
- Nonspecific interstitial pneumonia.
- Lymphocytic interstitial pneumonia.
- Desquamative interstitial pneumonia.
- Diffuse alveolar damage.
See also
References
- ↑ 1.0 1.1 1.2 1.3 Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 711. ISBN 978-1416031215.
- ↑ Nicolau, D. (Sep 2002). "Clinical and economic implications of antimicrobial resistance for the management of community-acquired respiratory tract infections.". J Antimicrob Chemother 50 Suppl S1: 61-70. PMID 12239229.
- ↑ Ohrui, T. (Sep 2005). "Preventive strategies for aspiration pneumonia in elderly disabled persons.". Tohoku J Exp Med 207 (1): 3-12. PMID 16082150.
- ↑ Limaye, AP.; Boeckh, M. (Nov 2010). "CMV in critically ill patients: pathogen or bystander?". Rev Med Virol 20 (6): 372-9. doi:10.1002/rmv.664. PMID 20931610.
- ↑ URL: http://www.pathologyoutlines.com/topic/lungnontumorCMV.html. Accessed on: 23 January 2012.