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13.09.26 Parosmia

Definition
  • Olfactory dysfunction that is characterized by the inability of the brain to properly identify an odour’s “natural” smell
  • Natural odour is transcribed into what is most often described as an unpleasant aroma, typically a “‘burned,’ ‘rotting,’ ‘faecal,’ or ‘chemical’ smell
  • There are instances, however, of pleasant odours (calledeuosmia)

Cause

  • Damage to olfactory receptor neurons (ORNs)
    • Post-URTI
    • Exposure to harmful solvents 
  • Central problem
    • Head trauma
    • Temporal lobe epilepsy (transient)
    • Parkinson's

Management
  • Symptoms usually decrease with time
  • Some evidence for L-Dopa
  • Induce anosmia or hyposmia to the point where the odours are negligible
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