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===Erythema nodosum=== | ===Erythema nodosum=== | ||
*Most common from of panniculitis.<ref name=pmid17375516>{{Cite journal | last1 = Schwartz | first1 = RA. | last2 = Nervi | first2 = SJ. | title = Erythema nodosum: a sign of systemic disease. | journal = Am Fam Physician | volume = 75 | issue = 5 | pages = 695-700 | month = Mar | year = 2007 | doi = | PMID = 17375516 | URL = http://www.aafp.org/afp/2007/0301/p695.html }}</ref> | |||
* | |||
* | Causes - mnemonic ''NODOSUM'':<ref name=pmid17375516/> | ||
*'''NO''' cause (idiopathic) ~ 55% of cases. | |||
*'''D'''rugs (sulfonamides, amoxicillin, oral contraceptives) ~ 5% of cases. | |||
*'''O'''ther infections - group A streptococci (streptococcal pharyngitis), Yersinia, chlamydia, mycobacteria, others ~ 30% of cases. | |||
*[[sarcoidosis|'''S'''arcoidosis]] ~ 7% of cases. | |||
*[[ulcerative colitis|'''U'''lcerative colitis]] & [[Crohn's disease]] ~ 2% of cases. | |||
*'''M'''alignancy ([[leukemia]], [[Hodgkin's lymphoma]]) ~ 1% of cases | |||
====Microscopic==== | ====Microscopic==== | ||
Features:<ref name=Ref_PBoD8_1199>{{Ref PBoD8|1199}}</ref> | Features:<ref name=Ref_PBoD8_1199>{{Ref PBoD8|1199}}</ref> | ||
*Expanded (inter-adipocyte cluster) septa. | *Expanded (inter-adipocyte cluster) septa. | ||
* | *[[Neutrophil]]s. | ||
*Fibrin. | *Fibrin. | ||
Notes: | Notes: | ||
*No vasculitis. | *No [[vasculitis]]. | ||
===Erythema induratum=== | ===Erythema induratum=== | ||
Features:<ref name=Ref_PBoD8_1199>{{Ref PBoD8|1199}}</ref> | Features:<ref name=Ref_PBoD8_1199>{{Ref PBoD8|1199}}</ref> |
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