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Nodular fasciitis
Nodular fasciitis, also known as nodular pseudosarcomatous fasciits,〔 pseudosarcomatous fasciitis, and subcutaneous pseudosarcomatous fibromatosis,〔Freedberg, et al. (2003). ''Fitzpatrick's Dermatology in General Medicine''. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.〕 is a benign soft tissue lesion most commonly found in the superficial fascia. The lesion commonly occurs in the first three decades of life. Upper extremities and trunk are the most common affected anatomical sites. Previous history of trauma may be present. Clinically and histologically, nodular fasciitis may be mistaken for a sarcoma.
==Etiology and clinical course==
Until recently, nodular fasciitis have been considered a reactive process of uncertain etiology.〔Oliveira AM, Chou MM. USP6-induced neoplasms: the biologic spectrum of aneurysmal bone cyst and nodular fasciitis. Hum Pathol. 2013 Jun 11. doi:pii: S0046-8177(13)00116-0. . PMID 23769422.〕 However, recent findings indicate that nodular fasciitis is a self-limited clonal neoplastic process (see below). Clinically, nodular fasciitis presents as a subcutaneous "growth" over a period of 3–6 weeks that eventually regresses. The lesion usually reaches a size of 2–3 cm. Larger lesions are unusual. Local recurrence has been described after simple surgical excision but it is rare.
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