title: Ectopic epididymal tissue in appendix testis.
abstract: Aberrant epididymal tissue is uncommon and may be associated with an undescended testis. To the best of our knowledge, aberrant epididymal tissue has not been described in a testicular appendix. We report the case of a 7-year-old boy with left cryptorchidism who underwent a homolateral orchidopexy. At operation, the surgeon removed a pedunculated appendix testis containing an epididymal heterotopia. This Wolffian-derivative tissue was confirmed by the diffuse strong CD10 reactivity of the luminal border of the epithelial cells. Awareness of this aberrant tissue avoids misinterpretation as a transected functional reproductive structure.
authors.affiliation: Departamento de Anatomía Patológica, Hospital Universitario Marqués de Valdecilla, Universidad de Cantabria, Avda. Valdecilla s/n, ES-39008, Santander, Spain. apavbj@humv.es
authors.forename: J Fernando
authors.initials: JF
authors.lastname: Val-Bernal
authors.forename: Daniel
authors.initials: D
authors.lastname: Val
authors.forename: M Francisca
authors.initials: MF
authors.lastname: Garijo
mesh_terms: D015415:Biomarkers / Q000378:metabolism; D002648:Child; D002828:Choristoma / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D003456:Cryptorchidism / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D004822:Epididymis; D006801:Humans; D008297:Male; D015260:Neprilysin / Q000378:metabolism
chemical_list: D015415:Biomarkers; D015260:Neprilysin