Breast malignant
Carcinoma subtypes
Lobular carcinoma - alveolar variant


Topic Completed: 1 August 2012

Minor changes: 25 June 2020

Copyright: 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Alveolar variant of lobular carcinoma

Monika Roychowdhury, M.D.
Page views in 2020 to date: 40
Cite this page: Roychowdhury M. OLD alveolar. PathologyOutlines.com website. http://www.pathologyoutlines.com/oldtopics/breastmalignantlobularalveolar.html. Accessed August 7th, 2020.
Clinical features
Case reports
Microscopic (histologic) description
  • Sharply outlined (rounded) groups or nests of 20 or more cells, resembling alveoli, separated by delicate fibrovascular tissue
  • May have osteoclast giant cells (Pathologica 1993;85:525)
Microscopic (histologic) images

AFIP images

Tumor cells in discrete
rounded aggregates separated
by fibrous stroma

Cytology description
Electron microscopy description
  • Tumor cells are similar to classic lobular tumors, but nests of cells are surrounded by elongated fibroblasts or myofibroblasts (Ultrastruct Pathol 1986;10:311)
Differential diagnosis
  • Lobular carcinoma in situ: groups of cells have distinct myoepithelial layer and basement membrane
  • Lymphoma: negative for epithelial markers, positive for lymphocytic markers
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