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==Granuloma annulare== | |||
===General=== | |||
*Benign and self-limited condition. | |||
*Etiology unknown - may be assoc. with trauma.<ref name=Ref_Derm51>{{Ref Derm|51}}</ref> | |||
===Microscopic=== | |||
Features:<ref name=Ref_Derm51>{{Ref Derm|51}}</ref> | |||
*Dermal palisading granuloma around: | |||
**Mucin - '''key feature''' | |||
***Loose/pale, paucicellular, eosinophilic. | |||
**+/-Necrotic collagen. (???) | |||
*+/-Eosinophils. | |||
Notes: | |||
*There may be multiple small foci with intervening normal dermis. | |||
*Histomorphologically similar to ''[[Rheumatoid nodule]]''. (???) | |||
DDx: | |||
*Necrobiosis lipoidica - little mucin, no normal dermis between foci.<ref name=Ref_Derm51>{{Ref Derm|51}}</ref> | |||
Images: | |||
*[http://www.dermaamin.com/site/histopathology-of-the-skin/61-i/1813-interstitial-granuloma-annulare-.html Granuloma annulare (dermaamin.com)]. | |||
==Keloid== | ==Keloid== | ||
===General=== | ===General=== |
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