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A 36-year-old member asked:

What is a fuzzy breast lump? my friend just had an ultrasound, and the dr said the outside of the lump looked "fuzzy". what does this mean? she also had to get a biopsy and is now awaiting the results.

2 doctor answers3 doctors weighed in
Dr. Geoffrey Rutledge
Internal Medicine 41 years experience
What : What does this mean? She also had to get a biopsy and is now awaiting the results. In general terms, a mass with "fuzzy", irregular, or spiculated margins is more concerning for cancer. Cancers often invade the surrounding tissue which is why their margins are poorly defined (the surrounding tissue is infiltrated by cancer). Generally, most benign lesions such as fibroadenoma, cyst, lipoma, etc. Have well-defined, rounded borders because these benign lesions do not invade the surrounding tissue.
Dr. Lester Thompson
Pathology 33 years experience
Irregular edge: Ultrasound usually shows a border to a breast mass. If the edges are "fuzzy" this means they are not well defined. For example, a cyst, as a well defined border. A fibroadenoma has a discrete capsule or broder. When it is fuzzy, it is more challenging to know if it is benign or malignant, and that is why a biopsy was ordered.

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Last updated Feb 24, 2018

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