Mammary duct ectasia with bloody nipple discharge in a child
A 14-month-old boy exhibited a mass in the right breast with bloody nipple discharge for 2 weeks before presenting a our hospital. There were no abnormalities in the patient's medical, familial, or developmental histories or in the maternal medical history. On physical examination, a 1-cm palpable mass without tenderness was noted in the subareolar region of the upper right breast. When the mass was squeezed, dark brown nipple discharge appeared (). There were no signs of inflammation in the physical examination or laboratory findings.\nAn ultrasonogram revealed a 1.0 cm × 0.8 cm multiseptated cystic mass in the right subareolar region. The macrocystic portion of the mass exhibited internal echogenicity. Minimal septal vascular flow was noted, and the mass was thought to be a complicated hemorrhagic lymphangioma or mammary duct ectasia ().\nSurgical excision was performed via a circumareolar incision, and a dark, bloody, fluid-filled cystic mass was removed. The mass, which was connected to main duct, was completely excised ().\nThe pathologic diagnosis was mammary duct ectasia. A microscopic analysis of the specimen demonstrated multiple dilated ducts with periductal fibrosis. The lumens of the dilated ducts contained histiocytes and degenerated epithelial cells, and duct stasis was observed ().