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Hydrothorax in a dog(Courtesy of Susan Rhind)
  • Accumulation of oedema fluid
  • Same causes as oedema elsewhere
  • Due to congestive heart failure, neoplasia in the cavity (especially thymus or regional lymph nodes), protein-losing disease
  • Grossly:
    • Whitening of pleura in long standing disease due to mesothelial hyperplasia and fibrosis
  • Present in some specific diseaes: