[Idiopathic prepubertal gynecomastia].

Prepuberal gynecomastia is extremely rare. We present a case of unilateral and idiopathic gynecomastia in a six years old male. Endocrinology test and anamnesis did not find pathology or drug ingestion. A mastectomy was performed, because the big size and progressive evolution of breast produced physicology problems. We review the literature and remark infrequent aspects of our case, also the complete clinic and pathologic study.