A 13-year-old girl with virginal hypertrophy (bilateral extensive juvenile hypertrophy) of the breasts is presented. Her breasts began to grow rapidly after puberty and reached an enormous size within a year. On examination, both breasts were greatly enlarged. Routine blood chemistry and the endocrinological investigations were normal. The computerized tomography scan of the sella was unremarkable. A bilateral reduction mammaplasty was performed, and histological analysis of the breast tissue revealed the diagnosis of virginal hypertrophy. After four months her breasts began to grow again, and a second mammaplasty was performed. After this operation, tamoxifen citrate was given to prevent recurrence for four months, and during the follow-up period of 20 months, no recurrence was noted.