Difference between revisions of "Organizing pneumonia"
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'''Organizing pneumonia''', abbreviated '''OP''', is a histologic pattern in [[lung pathology]]. | '''Organizing pneumonia''', abbreviated '''OP''', is a histologic pattern in [[lung pathology]]. | ||
Revision as of 02:03, 31 May 2014
Organizing pneumonia, abbreviated OP, is a histologic pattern in lung pathology.
General
- Multiple causes, e.g. transplant rejection, infection.
Clinical diagnoses:[1]
- Transplant rejection.
- Cryptogenic organizing pneumonia (COP), AKA (idiopathic) bronchiolitis obliterans organizing pneumonia (BOOP).
- Should not be confused with constrictive bronchiolitis (AKA bronchiolitis obliterans).
- Collagen vascular disease.
- Toxic injury.
- Infection.
- Peri-tumor - in proximity to a space-occupying lesion (abscess, neoplasm).
Note:
- BOOP is used as a synonym for organizing pneumonia which has the long differential diagnosis above.[1]
- Confusingly, it may be used to refer to the idiopathic form of organizing pneumonia, now generally known as cryptogenic organizing pneumonia (COP).
- In other words, strictly speaking, BOOP is not the same as COP; idiopathic BOOP is COP.
- Confusingly, it may be used to refer to the idiopathic form of organizing pneumonia, now generally known as cryptogenic organizing pneumonia (COP).
Microscopic
Features:[2]
- Distal airway disease -- airways plugged with organizing exudate ("Masson bodies").
- "Organized exudate" = fluffy light-staining paucicellular regions with stellate cells (fibroblasts & immature connective tissue).
- No hobnailing of pneumocytes.
- Type 2 pneumocytes hyperplasia is absent.
DDx:
- Diffuse alveolar damage, proliferative phase - has type 2 pneumoncyte hyperplasia.
- Bronchiolitis obliterans.
Images
Masson body - intermed. mag. (WC/Nephron)
Masson body - very high mag. (WC/Nephron)
www:
See also
References
- ↑ 1.0 1.1 Humphrey, Peter A; Dehner, Louis P; Pfeifer, John D (2008). The Washington Manual of Surgical Pathology (1st ed.). Lippincott Williams & Wilkins. pp. 91. ISBN 978-0781765275.
- ↑ Klatt, Edward C. (2006). Robbins and Cotran Atlas of Pathology (1st ed.). Saunders. pp. 110. ISBN 978-1416002741.
- ↑ URL: http://150.59.224.157/pathology/index.php?first_category_id=2&second_category_id=20. Accessed on: 4 August 2011.