Spontaneous infarction of fibroadenoma in an adolescent girl.

A 12-year-old pre-menarcheal girl presented with a solitary breast mass and bloody nipple discharge. Ultrasonography showed an unusual mass with complex characteristics, composed of a frondular structure within a 2.3 x 1.5-cm cyst. Histologic diagnosis of the excised structure was an infarcted fibroadenoma. This case describes the clinical presentation and unique sonographic appearance of a rare, spontaneous infarction of a fibroadenoma in an adolescent girl.