2020 Edition
| Editors: Maria Rosaria Raspollini, Antonio Lopez-Beltran

Adenomatoid Tumor

  • Maurizio ColecchiaEmail author
  • Simona Massa
Reference work entry
DOI: https://doi.org/10.1007/978-3-030-41894-6_4776


Benign mesothelioma


Adenomatoid tumor is a mesothelial proliferation showing a nested, tubular, or cord-like pattern of growth.

Clinical Features

  • Incidence

    It is the most common paratesticular tumor occurring in one third of the neoplasm of the region, and it is the most common benign neoplasm of testicular adnexa.

  • Age

    Adenomatoid tumors of paratesticular region occur across a wide range of ages most commonly between 20 and 50 years (mean age 36 years).

  • Sex

    Adenomatoid tumors occur in both sexes and are also found in the ovary, uterus, and fallopian tubes of the female genital tract.

  • Site

    Most reported cases originate in the epididymis, but they rarely occur in the spermatic cord, in the testicular tunica (albuginea or vaginalis), in ejaculatory ducts and in the prostate. The tail of epididymis is the most common site of occurrence. Most challenging cases are reported in the tunica albuginea with an intratesticular component.

  • Treatment

    Because of their benign...

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References and Further Reading

  1. Colecchia, M., & Nicolai, N. (2016). Frozen section in testicular pathology. In Pathology of testicular and penile neoplasms (pp. 203–212). Cham: Springer.CrossRefGoogle Scholar
  2. Perez-Ordonez, B., & Srigley, J. R. (2000). Mesothelial lesions of the paratesticular region. Seminars in Diagnostic Pathology, 17(4), 294–306.PubMedGoogle Scholar
  3. Skinnider, B. F., & Young, R. H. (2004). Infarcted adenomatoid tumor: A report of five cases of a facet of a benign neoplasm that may cause diagnostic difficulty. American Journal of Surgical Pathology, 28(1), 77–83.CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Uropathology Unit, Department of PathologyFondazione IRCCS Istituto Nazionale dei Tumori di MilanoMilanItaly