Disease or Syndrome
hydrothorax Audio
hy·dro·tho·rax [ hahy-druh-thawr-aks, -thohr- ]
Subclass of:
Pleural Diseases
Definitions related to hydrothorax:
  • A collection of watery fluid in the pleural cavity. (Dorland, 27th ed)
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • The accumulation of serous fluid within the pleural cavity.
    NCI
    U.S. National Cancer Institute, 2021
  • (transudative pleural effusion) A type of pleural effusion with a transudate (extravascular fluid with low protein content and a low specific gravity). Pleural effusions can be classified as transudates or exudates based on Light's criteria, which classify an effusion as exudate if one or more of the following are present: (1) the ratio of pleural fluid protein to serum protein is greater than 0.5, (2) the ratio of pleural fluid lactate dehydrogenase (LDH) to serum LDH is greater than 0.6, or (3) the pleural fluid LDH level is greater than two thirds of the upper limit of normal for serum LDH.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2025
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