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Leydig cell
The Leydig cells secrete the male sex hormone testosterone. In men, some testicular cancers can arise in the Sertoli and Leydig cells
A leydig cell tumor is a tumor of the testicle consisting of masses of abnormal interstitial cells that may secrete testosterone. This is an uncommon tumor in prepubertal children, but may be the cause of early puberty. It is found more commonly in adult males.