D2I2.
cancer

Leydig cell tumour

Leydig cell tumour, also Leydig cell tumor, (testicular) interstitial cell tumour and (testicular) interstitial cell tumor, is a member of the sex cord-stromal tumour group of and testicular cancers. It arises from Leydig cells. While the tumour can occur at any age, it occurs most often in young adults. However, in women it tends to happen after menopapuse.

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Plain-language summary adapted from Wikipedia. Not medical advice.