Misc breast diseases, asymmetries, and normal variants

Question 1

sternalis muscle

Answer 1

accessory parasternal chest wall muscle, <10% of individuals, usually unilateral

triangular or rounded shape seen only on CC view medially at far posterior depth

Question 2

accessory nipple

Answer 2

polythelia; 2% neonates and may be seen as a rounded mass along mammary crest

Question 3

poland syndrome

Answer 3

unilateral absence of the pectoralis major muscle; ipsilateral absence of breast tissue and syndactyly

Question 4

accessory breast tissue

Answer 4

common in the axillary tail

Question 5

lymphoma in the breast

Answer 5

usually from DLBCL
B cell lymphomas usually present with mass and adenopathy

indistinct margins or hypoechoic mass

Question 6

treatment for breast lymphoma

Answer 6

chemoradiation

Question 7

breast angiosarcoma

Answer 7

rare; primary or secondary due to prior breast conservation therapy with radiation therapy

T2 hyperintense with intense enhancement

Question 8

metastases to the breast

Answer 8

most commonly melanoma and RCC

circumscribed round masses; non-docutal distribution

Question 9

asymmetry

Answer 9

region of breast tissue prominent on only 1 view; usually superimposed glandular tissue

Question 10

global asymmetry

Answer 10

asymmetry involving majority of one breast > 1 quadrant

usually due to mass, architectural distortion, skin thieckening, palpable abnormality

Question 11

focal asymmetry

Answer 11

abnormality involving less than 1 quadrant on 2 views; not a mass

may be called benign after 2 years of stability (if labeled birads 3, even after additional views)

Question 12

architectural distortion

Answer 12

linear radiation from central point with no central mass visible; tehtering/indentation of breast tissue