Galactocele
Galactocele is the cystic formation observed in lactiferous
ducts containing milky fluid. The liquid, which is initially a
fluid, becomes thick, and may leak from the nipple.
Galactocele is believed to be caused by a plugged duct. On
palpation, it feels like a smooth and round-shaped mass, but
the diagnosis is established by aspiration or ultrasonography.
Treatment consists of aspiration. However, the cysts should
be surgically removed because they fill with milk again after
aspiration.