Amazia is the congenital absence of breasts on one or both sides.
Polymazia is the presence of accessory breasts, most commonly seen in the armpit. They may function during lactation.
Diffuse hypertrophy of the breasts is a condition in which the breasts attain enormous dimensions either during puberty or during the first pregnancy. The breasts may enlarge till the knees causing a lot of discomfort. Surgical treatment in the form of a reduction mammoplasty to decrease the size of the breasts is greatly helpful.