Breast nonmalignant
Benign tumors

Topic Completed: 1 January 2009

Minor changes: 10 September 2019

Copyright: 2002-2019,, Inc.

PubMed Search: Lipoma [title] breast

Hind Warzecha, M.D.
Page views in 2019: 1,930
Page views in 2020 to date: 787
Cite this page: Warzecha H. Lipoma . website. Accessed May 27th, 2020.
Definition / general
  • Tumor of mature fat cells without atypia
  • Most common benign tumor of male and female breast
  • Usually ages 40 - 60 years
  • Usually subcutaneous; less often intramammary
Clinical features
  • Asymptomatic, mobile, solitary
  • Recommended to confirm clinical and radiologic impression of lipoma with FNA, core biopsy or excision if necessary (Breast 2004;13:408)
Radiology images

Contributed by Dr. Mark R. Wick


Case reports
  • Excision usually not necessary, except to exclude other diagnoses
Gross description
  • Well circumscribed, thinly encapsulated, usually < 5 cm
Microscopic (histologic) description
  • Sheets of mature adipocytes without lipoblasts or atypia
  • Resembles surrounding fat
Microscopic (histologic) images

Images hosted on other servers

Mature adipose tissue without atypia

Cytology description
  • Fat cells
Positive stains
Differential diagnosis
  • Fatty area of breast tissue without encapsulation
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