{"paper_id":"2e963e61-065a-4b93-8bdb-2c57b0130093","body_text":"Abstract\nPrimary umbilical endometriosis accounts for 0.5–1% of extragenital endometriosis. Clinical presentation is typical and treatment involves complete excision. It is important to consider it in differential diagnosis of an umbilical nodule.\nReferences\nVictory R, Diamond MP, Johns DA (2007) Villar’s nodule: a case report and systematic literature review of endometriosis externa of the umbilicus. J Minim Invasive Gynecol 14(1):23–32\nTidman MJ, MacDonald DM (1988) Cutaneous endometriosis: a histopathologic study. J Am Acad Dermatol 18:373–377\nFrischknecht F, Raio L, Fleischmann A, Dreher E, Luscher KP, Mueller MD (2004) Umbilical endometriosis. Surg Endosc 18:345–349\nSchachter LR, Tash J, Olgac S, Bochner BH (2003) Umbilical endometriosis. J Urol 170(6):2388–2389\nAgarwal A, Fong YF (2008) Cutaneous endometriosis. Singapore Med J 49(9):704–709\nConflict of interest\nWe have no conflict of interest.\nAuthor information\nAuthors and Affiliations\nCorresponding author\nRights and permissions\nAbout this article\nCite this article\nDadhwal, V., Gupta, B., Dasgupta, C. et al. Primary umbilical endometriosis: a rare entity. Arch Gynecol Obstet 283 (Suppl 1), 119–120 (2011). https://doi.org/10.1007/s00404-010-1809-2\nReceived:\nAccepted:\nPublished:\nIssue date:\nDOI: https://doi.org/10.1007/s00404-010-1809-2","source_license":"CC0","license_restricted":false}