Gynecomastia is a benign, abnormal, growth of the male breast gland which can occur unilaterally or bilaterally, resulting from a proliferation of glandular, fibrous and adipose tissue. Gynecomastia is characterised by the presence of soft, 2–4 cm in diameter, usually discusshaped enlargement of tissues under the nipple. It is estimated that this pathology occurs in 32–65% of men over the age of 17. Gynecomastia is a psychosocial problem and may lead to a perceived lowering of quality of life. The main cause of gynecomastia is a loss of equilibrium between oestrogens and androgens. Increased sensitivity for oestrogens of the breast gland, or local factors (e.g. an excessive synthesis of oestrogens in breast tissues or changes in...