Abstract
Contrary to what it might seem macroscopically, throughout childhood the testicle undergoes profound changes. From birth to puberty, two waves of proliferation and differentiation of germ cells are produced. One of them takes place between 3 and 6 months of life and is known as mini-puberty. Under the action of FSH, LH, and the testosterone, gonocytes that still persist differentiate into Ad spermatogonia, and the Sertoli cells proliferate. The other wave takes place at 4 years of age, when first-order spermatocytes, coinciding with the appearance of androgen receptors in the Sertoli cells, appear transiently. In about half of the congenitally undescended testes, in the contralateral scrotal testis, in acquired undescended testes, and in retractile testicles, the diameter of the seminiferous tubules and the number of germ cells are not only too low but do not undergo the two waves of proliferation and differentiation of germ cells. Testicular biopsy performed at the time of early orchiopexy (6–12 months old) has been the evidence that provided more data to the knowledge of the pathogenesis of lesions in cryptorchidism. It is also considered the basis for selecting the group of patients who may benefit from hormonal treatment in addition to orchiopexy. In this chapter the most important data on the structure and function of the testis in fetal and childhood life, and both clinical and basic histological data to assess the reproductive capacity of an undescended testicle, are collected to finally provide a histological classification that facilitates the interpretation of the lesions.
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Nistal, M., González-Peramato, P., Serrano, Á. (2017). Helpful Data for Evaluating an Undescended Testis in Childhood. In: Clues in the Diagnosis of Non-tumoral Testicular Pathology. Springer, Cham. https://doi.org/10.1007/978-3-319-49364-0_11
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DOI: https://doi.org/10.1007/978-3-319-49364-0_11
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