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| ==Panniculitis== | | ==Panniculitis== |
| DDx: | | {{Main|Panniculitis}} |
| *Erythema nodosum. | | This is dealt with in the ''[[panniculitis]]'' article. |
| *Erythema induratum. | | |
| | DDx for panniculitis: |
| | *[[Erythema nodosum]]. |
| | *[[Erythema induratum]]. |
| *Self-inflicted trauma. | | *Self-inflicted trauma. |
| *Systemic lupus erythematosus. | | *[[Systemic lupus erythematosus]]. |
| *Weird stuff. | | *Weird stuff. |
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| ===Erythema nodosum===
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| *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>
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| Causes - mnemonic ''NODOSUM'':<ref name=pmid17375516/>
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| *'''NO''' cause (idiopathic) ~ 55% of cases.
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| *'''D'''rugs (sulfonamides, amoxicillin, oral contraceptives) ~ 5% of cases.
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| *'''O'''ther infections - group A streptococci (streptococcal pharyngitis), Yersinia, chlamydia, mycobacteria, others ~ 30% of cases.
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| *[[sarcoidosis|'''S'''arcoidosis]] ~ 7% of cases.
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| *[[ulcerative colitis|'''U'''lcerative colitis]] & [[Crohn's disease]] ~ 2% of cases.
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| *'''M'''alignancy ([[leukemia]], [[Hodgkin's lymphoma]]) ~ 1% of cases
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| ====Microscopic====
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| Features:<ref name=Ref_PBoD8_1199>{{Ref PBoD8|1199}}</ref>
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| *Expanded (inter-adipocyte cluster) septa.
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| *[[Neutrophil]]s.
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| *Fibrin.
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| Notes:
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| *No [[vasculitis]].
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| ===Erythema induratum===
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| Features:<ref name=Ref_PBoD8_1199>{{Ref PBoD8|1199}}</ref>
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| *Not common.
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| *Etiology: unknown.
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| ====Microscopic====
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| Features:<ref name=Ref_PBoD8_1199>{{Ref PBoD8|1199}}</ref>
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| *Necrotizing granulomatous inflammation.
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| *Necrotizing vasculitis of small/medium sized vessels (early).
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| DDx:
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| *Infection.
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| =Rare= | | =Rare= |