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Updated: Aug 6, 2026

Mouse Models of Epididymitis Induced by Pathogen-Associated Molecular Patterns
Published on: December 12, 2025
Ectopic epididymal tissue in appendix testis
J Fernando Val-Bernal1, Daniel Val, M Francisca Garijo
1Departamento de Anatomía Patológica, Hospital Universitario Marqués de Valdecilla, Universidad de Cantabria, Avda. Valdecilla s/n, ES-39008, Santander, Spain. apavbj@humv.es
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.
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