Cystic hygroma of the breast in a 5 year old boy presenting as a gynecomastia.

Cystic hygroma, also known as lymphangioma, are unusual congenital malformations of the lymphatic system. Cystic lymphangioma is a rare lesion in the breast of children. Only a few cases have been documented in literature. We report a rare case of a 5-year-old boy presented with a gradually enlarging, painless breast mass which was identified sonographically and histologically as a breast lymphangioma and treated by surgical excision. A local excision of the lump was performed and a diagnosis of cystic lymphangioma was made. Cyst was surgically removed, with preservation of normal tissue, and histopathologic findings showed a lymphangioma. The patient is well, after one year of follow-up, with no complaints or recurrence.