Bladder, ureter & renal pelvis
Congenital anomalies
Arteriovenous malformation


Topic Completed: 1 June 2011

Minor changes: 12 June 2019

Copyright: 2003-2019, PathologyOutlines.com, Inc.

PubMed Search: Bladder arteriovenous malformation

Alcides Chaux, M.D.
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Cite this page: Chaux A. Arteriovenous malformation. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/bladderAVM.html. Accessed August 7th, 2020.
Definition / general
  • By definition, direct communication is present between arterioles and venules
Sites
  • More common in CNS, intestine, lung, extremities
  • Very rare in urinary bladder
Etiology
  • Can be congenital or acquired (post-traumatic)
Clinical features
  • The most common symptom is hematuria (gross or micro, persistent or intermittent, may be massive)
  • Other symptoms include dysuria, difficulty in voiding and urinary retention
  • Some cases are asymptomatic
Case reports
Treatment
  • Excision is adequate therapy
Gross description
Microscopic (histologic) description
  • Admixture of malformed vessels such as capillaries, arteries and venules
  • Abrupt changes in thickness of medial and elastic layers of vessels, abnormal vascular dilation
  • Often advanced small vessel disease, hemorrhage, ulceration (Hum Pathol 1986;17:94)
  • Involves submucosa but not muscularis propria
  • May be associated with pseudocarcinomatous epithelial hyperplasia of bladder (Am J Surg Pathol 2008;32:92)
Microscopic (histologic) images

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Brain images: arteriovenous malformation

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