Benign fibrous histiocytoma

Dermatofibroma
Classification and external resources
Specialty oncology
ICD-10 D23 (ILDS D23.L62)
ICD-9-CM 216.9
ICD-O M8830/0
DiseasesDB 29384
eMedicine derm/96
Patient UK Benign fibrous histiocytoma
MeSH D018219

Benign fibrous histiocytomas (also known as dermal dendrocytoma,[1] dermatofibroma,[2] fibrous dermatofibroma,[2] fibrous histiocytoma,[2] fibroma simplex,[1] nodular subepidermal fibrosis,[1] and sclerosing hemangioma[1]) are benign skin growths.[3]

Presentation

Dermatofibromas are hard solitary slow-growing papules (rounded bumps) that may appear in a variety of colours, usually brownish to tan; they are often elevated or pedunculated. A dermatofibroma is associated with the dimple sign; by applying lateral pressure, there is a central depression of the dermatofibroma. Although typical dermatofibromas cause little or no discomfort, itching and tenderness can occur. Dermatofibromas can be found anywhere on the body, but most often they are found on the legs and arms.[4] They occur most often in women; the male to female ratio is about 1:4.[5] The age group in which they most commonly occur is 20 to 45 years.

Some physicians and researchers believe dermatofibromas form as a reaction to previous injuries such as insect bites or thorn pricks.[5] They are composed of disordered collagen laid down by fibroblasts. Dermatofibromas are classed as benign skin lesions, meaning they are completely harmless, though they may be confused with a variety of subcutaneous tumours.[6] Deep penetrating dermatofibromas may be difficult to distinguish, even histologically, from rare malignant fibrohistocytic tumours like dermatofibrosarcoma protuberans.[7]

Immunohistochemical staining

Neoplasm CD34[1] Stromelysin-3[8] Factor XIIIa[5]
Dermatofibroma - + +
Dermatofibrosarcoma protuberans + - -

See also

References

  1. 1 2 3 4 5 Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0.
  2. 1 2 3 Freedberg; et al. (2003). Fitzpatrick's Dermatology in General Medicine (6th ed.). McGraw-Hill. p. 668. ISBN 0-07-138076-0.
  3. ↑ "benign fibrous histiocytoma" at Dorland's Medical Dictionary
  4. ↑ "dermatofibroma" at Dorland's Medical Dictionary
  5. 1 2 3 Dermatofibroma at eMedicine
  6. ↑ Jung, Kyu Dong; Lee, Dong-Youn; Lee, Joo-Heung; Yang, Jun-Mo; Lee, Eil-Soo (2011). "Subcutaneous Dermatofibroma". Annals of Dermatology 23 (2): 254–7. doi:10.5021/ad.2011.23.2.254. PMC 3130878. PMID 21747634.
  7. ↑ Hanly, A. J.; Jordà, M; Elgart, G. W.; Badiavas, E; Nassiri, M; Nadji, M (2006). "High proliferative activity excludes dermatofibroma: Report of the utility of MIB-1 in the differential diagnosis of selected fibrohistiocytic tumors". Archives of pathology & laboratory medicine 130 (6): 831–4. doi:10.1043/1543-2165(2006)130[831:HPAEDR]2.0.CO;2 (inactive 2015-06-11). PMID 16740036.
  8. ↑ Kim, H.J.; Lee, J.Y.; Kim, S.H.; Seo, Y.J.; Lee, J.H.; Park, J.K.; Kim, M.H.; Cinn, Y.W.; Cho, K.H.; Yoon, T.Y. (2007). "Stromelysin-3 expression in the differential diagnosis of dermatofibroma and dermatofibrosarcoma protuberans: Comparison with factor XIIIa and CD34". British Journal of Dermatology 157 (2): 319–24. doi:10.1111/j.1365-2133.2007.08033.x. PMID 17596171.
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