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Unilateral anosmia

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Unilateral anosmia, or one-sided loss of the sense of smell, is less common than the bilateral lesion and is less commonly detected by the routine enquiry in a neurological examination. However, once diagnosed there are relatively few causes which ought to be investigated.

Possible unilateral causes of anosmia include:

  • head trauma
  • frontal lobe lesion - e.g. meningioma of the olfactory groove - an early manifestation.

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