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Post-traumatic olfactory dysfunction.

R C Kern1, B Quinn, G Rosseau

  • 1Department of Otolaryngology-Head and Neck Surgery, Northwestern University, Chicago, Illinois 60611, USA.

The Laryngoscope
|December 29, 2000
PubMed
Summary
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Post-traumatic anosmia involves damage to peripheral olfactory nerve fibers and olfactory bulb changes. Surgical removal of olfactory bulbs permanently resolved debilitating dysosmia in a patient.

Area of Science:

  • Neurology
  • Pathology
  • Immunohistochemistry

Background:

  • Post-traumatic olfactory dysfunction, including anosmia (loss of smell) and dysosmia (distorted smell), is a common consequence of head trauma.
  • The precise mechanisms underlying these olfactory deficits and potential for recovery remain incompletely understood.

Observation:

  • A patient presented with complete anosmia after minor head trauma, followed by severe dysosmia and weight loss.
  • Histopathologic and immunocytochemical analyses were performed on the patient's olfactory bulbs post-neurosurgical removal.

Findings:

  • Olfactory bulb analysis revealed reduced nerve processes and glomeruli compared to controls.
  • Immunohistochemistry showed intact olfactory neuron-specific molecule OMP (olfactory marker protein) axonal projections from mucosa to the bulb.

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Implications:

  • Results suggest peripheral olfactory nerve fiber damage contributes to post-traumatic anosmia.
  • Findings offer insights into potential mechanisms of olfactory regeneration and recovery after head injury.