Other interstitial pneumonitis / fibrosis

Loeffler syndrome

Topic Completed: 1 September 2011

Minor changes: 12 August 2020

Copyright: 2003-2021,, Inc.

PubMed search: loeffler syndrome [title]

Elliot Weisenberg, M.D.
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Table of Contents
Definition / general
Cite this page: Weisenberg E. Loeffler syndrome. website. Accessed October 24th, 2021.
Definition / general
  • Acute eosinophilic pneumonia with transient diffuse pulmonary infiltrates composed primarily of eosinophils and serum eosinophilia
  • Characteristic imaging findings, so biopsy is rarely performed
  • Eosinophils may be present in sputum
  • Often associated with ascaris infection
  • Self limited - lasts only up to 1 month
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