title: Onchocercosis mansonella co-infection presenting as a subcutaneous nodule in a child.
abstract: A 11-year-old girl presented with a subcutaneous lesion on the forehead, thought to be an implantation dermoid cyst. Microscopic examination revealed an onchocercoma. Microfilariae were found in the blood indicating a co-infection with Mansonella perstans. This case demonstrates the diagnostic difficulties of a parasitic co-infection uncommonly encountered in Europe.
authors.affiliation: Department of Histopathology, Sheffield Children's NHS Foundation Trust. Sheffield. United Kingdom.
authors.forename: John Q
authors.initials: JQ
authors.lastname: Davies
authors.forename: Marta C
authors.initials: MC
authors.lastname: Cohen
authors.forename: Fiona
authors.initials: F
authors.lastname: Shackley
authors.forename: Tim C
authors.initials: TC
authors.lastname: Clarke
authors.forename: Richard E
authors.initials: RE
authors.lastname: Page
mesh_terms: D000818:Animals; D002648:Child; D003884:Dermoid Cyst / Q000175:diagnosis / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D005546:Forehead / Q000469:parasitology / Q000473:pathology; D006801:Humans; D008366:Mansonella / Q000472:pathogenicity*; D008368:Mansonelliasis / Q000175:diagnosis* / Q000473:pathology; D009854:Onchocerca / Q000472:pathogenicity*; D009855:Onchocerciasis / Q000175:diagnosis* / Q000473:pathology; D012878:Skin Neoplasms / Q000175:diagnosis / Q000473:pathology