Lung - nontumor
Other nonneoplastic disease
Arteriovenous fistula



Topic Completed: 1 October 2011

Revised: 30 January 2019, last major update October 2011

Copyright: (c) 2003-2017, PathologyOutlines.com, Inc.

PubMed search: arteriovenous fistula [title] pulmonary


Elliot Weisenberg, M.D.
Page views in 2018: 578
Page views in 2019 to date: 291
Cite this page: Weisenberg E. Arteriovenous fistula. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/lungnontumorAVfistula.html. Accessed July 18th, 2019.
Definition / general
  • Detect by xray
  • Often multiple lesions, most commonly in right lower and middle lobe
  • Probably congenital from persistent anastomotic fetal capillaries
  • Shunting of blood between arterial and venous circulations may be asymptomatic or cause bruit, cyanosis, polycythemia and low arterial oxygen content
  • Usually detected in patients 10 to 20 years old
  • Often patients have Osler-Rendu-Weber disease
Treatment
  • Excision or transcatheter embolization
Gross description
  • Large vascular channels with arteriovenous connections
Microscopic (histologic) description
  • Abnormal vessels with excess or deficiency of smooth muscle, making it difficult to differentiate veins and arteries
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