• A bacterial, fungal or parasitic abscess that develops in the lung parenchyma. Causes include aspiration pneumonia, necrotizing pneumonia, necrotizing malignant tumors, and Wegener's granulomatosis.
  NCI Thesaurus
  U.S. National Cancer Institute, 2021
• A circumscribed area of pus or necrotic debris in lung parenchyma, which leads to a cavity, and after formation of bronchopulmonary fistula, can manifest as an air-fluid level inside the cavity.
  Human Phenotype Ontology (HPO)
  The Human Phenotype Ontology Project, 2021
• Solitary or multiple collections of PUS within the lung parenchyma as a result of infection by bacteria, protozoa, or other agents.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• Lung abscess is a necrotizing lung infection characterized by a pus-filled cavitary lesion. It is most commonly caused by aspiration of oral secretions by patients who have impaired consciousness. Symptoms are persistent cough, fever, sweats, and weight loss. Diagnosis is based primarily on chest x-ray. Treatment usually is with a...
  Merck Manuals
  Merck & Co., Inc., 2020
• Lung abscess is defined as necrosis of the pulmonary tissue and formation of cavities containing necrotic debris or fluid caused by microbial infection. The formation of multiple small (< 2 cm) abscesses is occasionally referred to as necrotizing pneumonia or lung gangrene.
  Medscape
  WebMD, 2019
• A lung abscess is a localized collection of pus within the lung that leads to formation of a cavity, usually with a thick wall. Abscesses occur most commonly when microbial infection causes necrosis of the lung parenchyma, forming 1 or more cavities. Communication of such cavities with the bronchial tree results in a cough productive of...
  Epocrates
  Athenahealth, Inc., 2019