A 28-year-old man from Mumbai attends the andrology clinic with a 3-year history of infertility. His wife has normal fertility. Physical examination reveals normal external genitalia, testes of normal volume (15 mL each), and no gynaecomastia. Semen analysis shows oligozoospermia (8 million/mL; normal >15 million/mL) with 25% motility (normal >40%) and 18% normal morphology (normal >4%). Serum FSH is 7.2 mIU/mL (normal 1.5–12.4), LH is 6.8 mIU/mL (normal 1.7–8.6), and testosterone is 5.8 ng/mL (normal 3–10). Testicular biopsy shows reduced germ cell density with patchy areas of germ cell loss but preserved spermatogenesis in some tubules. Which of the following is the most likely diagnosis?
Which of the following cells in the seminiferous tubule is responsible for the production of anti-müllerian hormone (AMH)?
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