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A 35-year-old male presents to the family physician for bilateral gynecomastia. He observed a progressive increase in his breast size starting 6 months ago. He is sexually active and denies any drug use. Physical examination reveals bilateral gynecomastia and tenderness. The genito-urinary examination shows a 1 cm nodule in the right testis. Otherwise, the examination is within normal limits. The laboratory report shows: LH 3 U/L, FSH 2 U/L, testosterone 270 ng/dl (Normal 3 -10 ng/dl), estradiol 115 pg/ml (Normal 20 - 60 pg/ml), beta HCG undetectable, AFP undetectable. Which is the most likely diagnosis?
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