Supernumerary Breast in an Adolescent Boy

We present an adolescent boy with unilateral supernumerary breast. It wasa V type by Leung Clasification. Despite the average occurence between0,22 % and 6% in a normal population we have not had other cases in thelast 20 years. The patient was an asthenic boy of sixteen in the IV stage of puberty.Sometimes he felt swelling and tenderness in this breast tissue two years ago. Thesesymptoms became worse two months ago. At the admission he was symptom free. Inthe right hypochondrium inferomedially he had a nipple and areola with a small partof the glandular tissue. The axilla was empty. After an excision we got a 15x10x 8mmspecimen. Pathohistological report described incompletely formed mammary lobulewith smooth muscles and lactiferous ducts of nipple in dermis. This was consistentwith the diagnosis of ectopic breast tissue. He wanted it removed for esthetic reasons.His hormonal state was normal. All blood checks were normal. Kidney ultrasoundwas normal. His grandmother had pyelon duplex and frequent uroinfections. As itis known, there is an association between supernumerary breast tissue and renalmalformations. Since he did not have it, we think that a routine screening of theuropoetic system should be performed in any patient with supernumerary breast.