Skin - Nonmelanocytic tumors
Vascular tumors
Bacillary angiomatosis

Author: Christopher Hale, M.D. (see Authors page)

Revised: 6 October 2016, last major update July 2012

Copyright: (c) 2001-2016,, Inc.

PubMed search: bacillary angiomatosis [title] skin

Cite this page: Bacillary angiomatosis. website. Accessed October 28th, 2016.
Definition / General
  • Due to infection by Bartonella henselae
  • May involve soft tissue, lymph nodes, internal organs
  • May coexist with Kaposi‚Äôs sarcoma
  • Reactive but mimics a neoplasm, and commonly presents as multiple cutaneous neoplasms in HIV patients
Case Reports
  • Antibiotics
Clinical Images
Images hosted on other servers:

Exophytic lesion on neck

Small, cherry angiomata-like lesions and nodules

Gross Description
  • Red papules / nodules
Micro Description
  • Lobules of capillaries with epithelioid endothelial cells
  • Also fragmented neutrophils, granular purple extracellular bacteria
Micro Images
Images hosted on PathOut server:

Breast skin, courtesy of Dr. Mark R. Wick

Steiner stain, breast, courtesy of Dr. Mark R. Wick

Positive Stains
  • Silver stains (bacteria)
Electron Microscopy Description
Differential Diagnosis