Breast - nonmalignant
Benign tumors / changes
Lipoma of breast

Author: Hind Nassar, M.D. (see Authors page)

Revised: 8 August 2017, last major update January 2009

Copyright: (c) 2002-2017,, Inc.

PubMed Search: Lipoma [title] breast

Cite this page: Lipoma of breast. website. Accessed October 19th, 2018.
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

Images hosted on PathOut server:

Mammogram, 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