Pérez-García, CristinaAriza Jiménez, Ana BCamacho Lozano, Laurade la Cámara Moraño, Carmen2023-01-252023-01-252018http://hdl.handle.net/10668/12930Gynecomastia consists of breast enlargement due to a hormonal imbalance between estrogens and androgens. Unilateral and important breast growth requires ruling underlying pathologic disorders out. Mechanical cause is uncommon, causing enlargement by repeated stimulation. We report a 6-year-old boy with unilateral gynecomastia. Hyperprolactinemia is the only abnormal finding at laboratory tests. After repeated inquiries, a continuous breast selfstimulation is detected. Its relation with gynecomastia is verified because prolactin normalizes and breast regressed in further revisions, after stopping stimulus.esGynecomastiaPrepubertalChildGynecomastiaHumansHyperprolactinemiaMaleProlactin[Importance of the exhaustive anamnesis to an unexplained unilateral gynecomastia in a child].Importancia de la anamnesis exhaustiva ante una ginecomastia unilateral inexplicada en un niño.research article30204992open access10.5546/aap.2018.e6551668-3501https://doi.org/10.5546/aap.2018.e655