Breasts commonly have an extension towards the armpits. This extension may overdevelop into an inconvenient prominence. Sometimes a separate mass of breast tissue develops in one or both armpits. This may become noticeable during puberty in some patients. In others it grows to annoying proportion during pregnancy.
Accessory or "ectopic" (out of place) breast tissue can be removed surgically under general anaesthesia.
Belgian public healthcare covers treatment of this condition.