Invasive breast carcinoma of no special type and variants

Lipid rich

Last author update: 1 October 2012
Last staff update: 4 March 2021

Copyright: 2001-2022,, Inc.

PubMed search: lipid rich carcinoma breast

Monika Roychowdhury, M.D.
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Cite this page: Roychowdhury M. Lipid rich. website. Accessed July 5th, 2022.
Definition / general
  • 90%+ cells have prominent intracytoplasmic neutral lipid
Clinical features
  • 1% - 2% of breast carcinomas
  • Axillary metastases may resemble histiocytes
Prognostic factors
  • Poor prognosis due to frequent (70%) nodal metastases at presentation
Case reports
Gross description
  • Lobulated, variable circumscription, firm
  • 1 to 15 cm
Microscopic (histologic) description
  • Nests, cords and sheets of large polygonal cells with foamy or vacuolated cytoplasm containing lipid
  • May resemble clear cells or lipoblasts
  • Irregular nuclei with coarse chromatin, moderate atypia, prominent nucleoli
  • Other patterns are large pleomorphic cells in alveolar pattern with hobnail appearance, oncocytic or apocrine type change
Microscopic (histologic) images

AFIP images

Polygonal tumor cells
with distinct cell
borders and variable
cytoplasmic clearing

Positive stains
Negative stains
Electron microscopy description
Electron microscopy images

AFIP images

Luminal microvilli, lipid droplets and mitochondria

Differential diagnosis
Additional references
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