Difference between revisions of "Panniculitis"
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'''Panniculitis''' is inflammation of the adipose tissue. It is encountered in [[dermatopathology]] specimens. | '''Panniculitis''' is inflammation of the adipose tissue. It is encountered in [[dermatopathology]] specimens. | ||
= | |||
=Classification= | |||
*Lobular - involve fat lobules. | |||
*Septal - involve interlobular septae. | |||
==A simple general DDx== | |||
*[[Erythema nodosum]]. | *[[Erythema nodosum]]. | ||
*[[Erythema induratum]]. | *[[Erythema induratum]]. | ||
*Self-inflicted trauma. | *Self-inflicted trauma (factitial panniculitis). | ||
*[[Systemic lupus erythematosus]]. | *[[Systemic lupus erythematosus]]. | ||
* | *Other. | ||
==DDx by type== | |||
Septal: | |||
*[[Erythema nodosum]]. | |||
*Morphea profunda. | |||
Lobular:<ref name=pmid18948765>{{Cite journal | last1 = Brinster | first1 = NK. | title = Dermatopathology for the surgical pathologist: a pattern-based approach to the diagnosis of inflammatory skin disorders (part II). | journal = Adv Anat Pathol | volume = 15 | issue = 6 | pages = 350-69 | month = Nov | year = 2008 | doi = 10.1097/PAP.0b013e31818b1ac6 | PMID = 18948765 }}</ref> | |||
*Infectious panniculitis. | |||
*[[Erythema induratum]]. | |||
*[[SLE|Lupus panniculitis]]. | |||
*Pancreatic panniculitis. | |||
*Alpha1-antitrypsin deficiency. | |||
*Subcutaneous fat necrosis of the newborn. | |||
*Sclerema neonatorum. | |||
=Specific conditions= | =Specific conditions= | ||
Revision as of 19:17, 19 September 2011
Panniculitis is inflammation of the adipose tissue. It is encountered in dermatopathology specimens.
Classification
- Lobular - involve fat lobules.
- Septal - involve interlobular septae.
A simple general DDx
- Erythema nodosum.
- Erythema induratum.
- Self-inflicted trauma (factitial panniculitis).
- Systemic lupus erythematosus.
- Other.
DDx by type
Septal:
- Erythema nodosum.
- Morphea profunda.
Lobular:[1]
- Infectious panniculitis.
- Erythema induratum.
- Lupus panniculitis.
- Pancreatic panniculitis.
- Alpha1-antitrypsin deficiency.
- Subcutaneous fat necrosis of the newborn.
- Sclerema neonatorum.
Specific conditions
Erythema nodosum
Causes - mnemonic NODOSUM:[2]
- NO cause (idiopathic) ~ 55% of cases.
- Drugs (sulfonamides, amoxicillin, oral contraceptives) ~ 5% of cases.
- Other infections - group A streptococci (streptococcal pharyngitis), Yersinia, chlamydia, mycobacteria, others ~ 30% of cases.
- Sarcoidosis ~ 7% of cases.
- Ulcerative colitis & Crohn's disease ~ 2% of cases.
- Malignancy (leukemia, Hodgkin's lymphoma) ~ 1% of cases
Microscopic
- Expanded septa between fat lobules - key (low power) feature.
- Neutrophils.
- Lymphocytes.
- Histiocytes.
- Fibrin.
Notes:
- No vasculitis.
- +/-Granulomas.[6]
Images:
Erythema induratum
General
Features:[4]
- Uncommon.
- Etiology: unknown.
Clinical:[5]
- Classic location: posterior shins.
- Ulcerates and scars.
Microscopic
Features:[4]
- Predominantly lobular process with:[3]
- Necrotizing granulomatous inflammation.
- Necrotizing vasculitis of small/medium sized vessels (early).
DDx:
- Infection.
Images:
See also
References
- ↑ Brinster, NK. (Nov 2008). "Dermatopathology for the surgical pathologist: a pattern-based approach to the diagnosis of inflammatory skin disorders (part II).". Adv Anat Pathol 15 (6): 350-69. doi:10.1097/PAP.0b013e31818b1ac6. PMID 18948765.
- ↑ 2.0 2.1 Schwartz, RA.; Nervi, SJ. (Mar 2007). "Erythema nodosum: a sign of systemic disease.". Am Fam Physician 75 (5): 695-700. PMID 17375516.
- ↑ 3.0 3.1 URL: http://www.medscape.com/viewarticle/440356_8. Accessed on: 11 September 2011.
- ↑ 4.0 4.1 4.2 Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1199. ISBN 978-1416031215.
- ↑ 5.0 5.1 Mitchell, Richard; Kumar, Vinay; Fausto, Nelson; Abbas, Abul K.; Aster, Jon (2011). Pocket Companion to Robbins & Cotran Pathologic Basis of Disease (8th ed.). Elsevier Saunders. pp. 609. ISBN 978-1416054542.
- ↑ 6.0 6.1 URL: http://missinglink.ucsf.edu/lm/DermatologyGlossary/erythema_nodosum.html. Accessed on: 11 September 2011.