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| =Less common= | | =Less common= |
| ==Atypical fibroxanthoma==
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| *Abbreviated ''AFX''.
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| ===General===
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| *Typically head & neck region.<ref>URL: [http://emedicine.medscape.com/article/1056204-overview http://emedicine.medscape.com/article/1056204-overview]. Accessed on 2 September 2011.</ref>
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| *Thought to be related to [[pleomorphic undifferentiated sarcoma]].<ref>{{Cite journal | last1 = Withers | first1 = AH. | last2 = Brougham | first2 = ND. | last3 = Barber | first3 = RM. | last4 = Tan | first4 = ST. | title = Atypical fibroxanthoma and malignant fibrous histiocytoma. | journal = J Plast Reconstr Aesthet Surg | volume = | issue = | pages = | month = Jun | year = 2011 | doi = 10.1016/j.bjps.2011.05.004 | PMID = 21664889 }}</ref>
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| Clinical:
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| *Rapid growth.
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| *Elderly.
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| *Good prognosis.<ref name=pmid20526171>{{Cite journal | last1 = Beer | first1 = TW. | last2 = Drury | first2 = P. | last3 = Heenan | first3 = PJ. | title = Atypical fibroxanthoma: a histological and immunohistochemical review of 171 cases. | journal = Am J Dermatopathol | volume = 32 | issue = 6 | pages = 533-40 | month = Aug | year = 2010 | doi = 10.1097/DAD.0b013e3181c80b97 | PMID = 20526171 }}</ref>
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| ===Microscopic===
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| Features:<ref name=Ref_Derm521>{{Ref Derm|521}}</ref>
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| *Dermal lesion - '''key point'''.
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| *Marked nuclear atypia.
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| *Mitoses.
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| *Mulitnucleated cells.
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| *Foamy cytoplasm - '''key feature'''.
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| DDx:
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| *[[Melanoma]].
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| *[[Pleomorphic undifferentiated sarcoma]] (MFH).
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| *[[Leiomyosarcoma]].
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| *Sarcomatoid [[squamous carcinoma]].
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| ===IHC===
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| Features:<ref name=Ref_Derm521>{{Ref Derm|521}}</ref>
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| *S100 -ve (done to r/o melanoma).
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| *34betaE12 -ve, p63 -ve (done to exclude SCC).
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| *Desmin -ve (done to r/o leiomyosarcoma).
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| ==Granuloma annulare== | | ==Granuloma annulare== |
| ===General=== | | ===General=== |