Bilateral prepubertal testicular biopsies predict significance of cryptorchidism-associated mixed testicular atrophy, and allow assessment of fertility.
BACKGROUND
Mixed atrophy of the testis (MAT), a frequent finding in biopsies of formerly cryptorchid and/or infertile patients, is defined as the synchronous occurrence of both seminiferous tubules containing germ cells and Sertoli cell only-tubules in variable proportions. In tubules containing germ cells, different types of abnormalities in spermatogenesis may be seen. The presence of adult spermatids in the biopsy, even in small numbers, correlates with successful spermatozoa retrieval for "in vitro" fertilization techniques. Currently, it is unknown whether precursor lesions of MAT can be identified in cryptorchid patients during childhood.


METHODS
Eighteen formerly cryptorchid adults who had undergone testicular biopsies in childhood had a repeat testicular biopsy to evaluate infertility. In prepubertal biopsies, abnormalities of the testicular parenchyma were classified into types I (slight alterations), II (marked germinal hypoplasia), and III (severe germinal hypoplasia). In postpubertal biopsies, the percentage of tubules containing germ cells and Sertoli cell only-tubules were estimated, as well as the presence of complete spermatogenesis. Abnormalities in spermatogenesis were classified into lesions of the adluminal or basal compartments of seminiferous tubules.


RESULTS
Comparison between prepubertal and postpubertal biopsies revealed that most specimens developing from type III lesions presented with incomplete spermatogenesis (P<0.0001) and more severe lesions of the germinal epithelium (P=0.049).


CONCLUSIONS
Type III lesions correlated with MAT characteristics that confer a worse prognosis for in vitro fertilization. Thus, MAT characteristics may be predicted in prepubertal cryptorchid patients, allowing a fertility prognosis. The pathogenesis of these lesions, and their possible inclusion into the spectrum of the testicular dysgenesis syndrome, are discussed.
Nistal
Manuel
M
Department of Morphology, School of Medicine, Universidad Autonoma de Madrid, Madrid, Spain.
Paniagua
Ricardo
R
Riestra
María Luisa
ML
Reyes-Múgica
Miguel
M
Cajaiba
Mariana Morais
MM
D000328:Adult; D001284:Atrophy; D001706:Biopsy; D002675:Child, Preschool; D003456:Cryptorchidism / Q000150:complications / Q000473:pathology* / Q000503:physiopathology; D006801:Humans; D007246:Infertility / Q000209:etiology / Q000473:pathology* / Q000503:physiopathology; D008297:Male; D011237:Predictive Value of Tests; D011627:Puberty; D015203:Reproducibility of Results; D012671:Seminiferous Tubules / Q000473:pathology; D013091:Spermatogenesis; D013737:Testis / Q000473:pathology* / Q000503:physiopathology