Pneumonia

From Libre Pathology
Revision as of 11:26, 5 March 2017 by Michael (talk | contribs) (Aspiration pneumonia: split out)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
Acute pneumonia. H&E stain. (WC)

Pneumonia is inflammation of the lung, which includes infectious and non-infectious etiologies.

It is a subset of the medical lung diseases. This article primarily deals with the infectious pneumonias.

Idiopathic interstitial pneumonias are listed at the bottom; they are dealt with in detail in the diffuse lung diseases article.

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

The most common form of pneumonia. It is usually diagnosed clinically.

Chronic infectious pneumonia

General

Common microorganisms:[1]

Note:

  • All of the later ones are granulomatous.

Microscopic

Features:

Aspiration pneumonia

Cytomegalovirus pneumonia

General

  • Immunodeficiency.
  • Critical illness.[2]

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

  • AKA idiopathic interstitial pneumonia.

Histologic pattern:

See also

References

  1. 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.
  2. 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.
  3. URL: http://www.pathologyoutlines.com/topic/lungnontumorCMV.html. Accessed on: 23 January 2012.