A 28-year-old man presents with infertility. He and his partner have been trying to conceive for over a year without success. The patient undergoes a standard fertility evaluation, including a semen analysis, which reveals severe oligospermia (a very low sperm count). His physical examination is unremarkable, with normal testicular size and no signs of hormonal imbalance. Hormonal testing shows normal levels of testosterone, follicle-stimulating hormone (FSH), and luteinizing hormone (LH), ruling out hormonal causes of infertility. Given the unexplained severe oligospermia, genetic testing is performed, which identifies a microdeletion in the AZFb region of the Y chromosome. To further evaluate the cause of the oligospermia, a testicular biopsy is performed to assess the histopathology of the testicular tissue. What is the most likely histopathological finding in the testes of this patient?
