Lung - nontumor
Other nonneoplastic disease
Arteriovenous fistula

Author: Elliot Weisenberg, M.D. (see Authors page)

Revised: 9 March 2017, last major update October 2011

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

PubMed search: arteriovenous fistula [title] pulmonary

Cite this page: Arteriovenous fistula. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/lungnontumorAVfistula.html. Accessed June 29th, 2017.
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