Neoplastic degeneration of chronic sacrococcygeal pilonidal sinus: report of seven cases and literature review by Iván Couto-González, Francisco J. González-Rodríguez, Ignacio Vila, Beatriz Brea-García, Luís García-Vallejo, Santiago Soldevila-Guilera, Javier Baltar-Boileve, Antonio Taboada-Suárez

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