title: Case for diagnosis.
abstract: We report the case of an 11-year-old male patient with a histopathological and immunohistochemical diagnosis of dermatofibroma with an atypical clinical presentation on the right forearm. Although dermatofibroma is considered a benign skin tumor, some of its differential diagnoses, such as dermatofibrosarcoma protuberans and malignant fibrous histiocytoma, are truly aggressive. Lesions with atypical clinical aspects and topology associated with specific histopathological variants are some of the criteria for complete tumor excision.
authors.affiliation: Hospital Federal de Bonsucesso, Rio de Janeiro, RJ, Brazil.
authors.forename: Felipe Maurício Soeiro
authors.initials: FM
authors.lastname: Sampaio
authors.affiliation: Hospital Federal de Bonsucesso, Rio de Janeiro, RJ, Brazil.
authors.forename: Gustavo Vieira
authors.initials: GV
authors.lastname: Gualberto
authors.affiliation: Universidade Gama Filho, Rio de Janeiro, RJ, Brazil.
authors.forename: Fernando Gustavo Mósca de
authors.initials: FG
authors.lastname: Cerqueira
authors.affiliation: Hospital Municipal Jesus, Rio de Janeiro, RJ, Brazil.
authors.forename: Ana Maria Mósca de
authors.initials: AM
authors.lastname: Cerqueira
authors.affiliation: Policlínica Geral do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Curt Mafra
authors.initials: CM
authors.lastname: Treu
authors.affiliation: Hospital Federal de Bonsucesso, Rio de Janeiro, RJ, Brazil.
authors.forename: Thiago Jeunon de Sousa
authors.initials: TJ
authors.lastname: Vargas
mesh_terms: D001706:Biopsy; D002648:Child; D003937:Diagnosis, Differential; D005542:Forearm / Q000473:pathology; D018219:Histiocytoma, Benign Fibrous / Q000473:pathology*; D006801:Humans; D008297:Male; D012867:Skin / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*