“…Until some time ago, no pathological examination was carried out in these cases, and BND was associated with hormonal ductal hyperplasia (6,7). Ductal ectasia, the main cause of BND in adults and also the cause of BND in this case report, has been described in premenarcheal girls (8,9), in prepuberal boys with breast enlargement (7,10), in prepuberal boys without breast enlargement (3,5,6), and in newborns (6,11,12).…”