Abstract
Pubertal gynecomastia normally occurs as a transient phenomenon of several months duration, whereas marked pubertal gynecomastia (more than 6 cm in diameter) may persist into aduldhood. In the present study the possible involvement of prolactin (PRL) secretion in the development of marked pubertal gynecomastia was investigated. The diurnal variations of PRL, luteinizing hormone (LH), follicle-stimulating hormone (FSH), as well as the basal values of testosterone (T) and estradiol (E2) were determined in 5 pubertal boys with marked gynecomastia and in 5 age-matched controls. Mean age of all patients was 14.4 years. The pubertal development was classified as P 3–4.
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