Causes of mismatched perfusion defects on a ventilation perfusion scan

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What are the causes of mismatched perfusion defects on a ventilation perfusion scan?

Although mismatched perfusion defects are most likely to be associated with acute PE, there are other potential etiologies that should be considered as well. Some of these causes are listed below

Some Causes of Mismatched Perfusion Defects on a V/Q Scan

  • • Acute PE
  • • Chronic PE
  • • Other types of PE (foreign bodies, gas, fat)
  • • Vascular-obstructive tumor
  • • Vascular-obstructive lymphadenopathy
  • • Pulmonary artery hypoplasia or atresia
  • • Swyer-James syndrome
  • • Vasculitis

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