A woman has a breast mass that is not well delineated and is nonpalpable, immobile, and nontender. This is most likely:
a. Fibroadenoma. c. Intraductal papilloma.
b. Lipoma. d. Mammary duct ectasia.
ANS: C
Intraductal papilloma is the only benign breast mass that is nonpalpable. Fibroadenoma is well delineated, palpable, and movable. Lipoma is palpable and movable. Mammary duct ectasia is not well delineated and is immobile, but it is palpable and painful.
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