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Giant cell collagenoma: case report and review of the literature
Author(s) -
Brito Hugo,
Pereira Emílio M.,
ReisFilho Jorge S.,
Maeda Sueli A.
Publication year - 2002
Publication title -
journal of cutaneous pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 75
eISSN - 1600-0560
pISSN - 0303-6987
DOI - 10.1034/j.1600-0560.2002.290109.x
Subject(s) - pathology , giant cell , vimentin , anatomy , fibroma , dermatofibroma , lesion , biology , immunohistochemistry , medicine
Background: Giant cell collagenoma (GCC) is a recently described cutaneous fibrous neoplasm that usually affects young to middle‐aged adults. Despite its similar histological appearance with circumscribed storiform collagenoma, no association of GCC with Cowden's syndrome has been described so far. To the best of our knowledge only five cases of this rare fibrous tumor have been reported so far. Methods: We report a case of a 79‐year‐old male patient presenting with a slow growing flesh‐colored dome‐shaped lesion in his left forearm, with a clinical diagnosis of fibroma. No stigma of Cowden's syndrome was depicted. Results: The histological analysis showed a symmetrical and well‐circumscribed flat‐dome‐shaped lesion covered by an atrophic overlying epidermis. The neoplasm was composed of hyalinized collagen bundles disposed in a whorled storiform pattern. Admixed with the collagen matrix, there were two distinct cell populations, one composed by spindle‐shaped mononuclear cells, and the other composed by bizarre multinucleated giant cells. Immunohistochemical analysis showed positivity for vimentin and actin HHF35 in the mononucleated. The multinucleated cells only immunoexpressed vimentin. Conclusion: GCC is an unusual cutaneous fibrous tumor that should be differentiated from circumscribed storiform collagenoma, pleomorphic fibroma, regressive forms of dermatofibroma, and solitary myofibroma based on its histological features.