Milky cyst caused by obstruction of the lactiferous duct in a lactating or pregnant patient is called?

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Milky cysts occur when a lactiferous duct becomes obstructed during lactation or pregnancy, allowing milk to back up and form a cyst. This milk-filled dilation is called a galactocele—the name itself comes from milk (galacto-) and swelling/cyst (-cele). It’s a benign finding tied to physiologic milk production rather than a neoplasm. The other terms describe different breast conditions (fibroadenolipoma is a mixed fibrous/glandular/fat mass, gynecomastia is male breast enlargement, hamartoma is a benign mass of normal breast components) and do not describe milk retention due to duct obstruction.