Radiological Diagnosis for Posttraumatic Olfactory Dysfunction

외상 후 후각이상에 대한 방사선학적 진단

  • Ahn, Jung Yong (Department of Neurosurgery, Pundang CHA Hospital, Pochon CHA University) ;
  • Joo, Jin Yang (Department of Neurosurgery, Yonsei University College of Medicine) ;
  • Chung, Tae Sub (Department of Diagnostic Radiology, Yonsei University College of Medicine)
  • 안정용 (포천중문대학교 의과대학 분당차병원 신경외과학교실) ;
  • 주진양 (연세대학교 의과대학 신경외과학교실) ;
  • 정태섭 (연세대학교 의과대학 방사선학교실)
  • Received : 1999.12.15
  • Accepted : 2000.10.31
  • Published : 2000.12.28


Objective : To evaluate objectively the sites of injury in patients with posttraumatic olfactory deficits and to suggest the diagnostic procedure for evaluation of posttraumatic anosmia. Methods : Ten patients with posttraumatic olfactory dysfunction were examined by means of olfactory testing, sinoscopy, contrast filled paranasal sinus computed tomography(contrast filled PNS CT) and magnetic resonance imaging(MRI). Five normal persons without olfactory dysfunction were also evauluated. The aerodynamic patency of olfactory cleft was examined by contrast filled PNS CT. The olfactory system(oflactory bulbs, olfactory tracts, inferior frontal region, hippocampi, or temporal lobes) was investigated in detail with MRI. The difference in the size of the olfactory bulb between normal volunteers and anosmic patients was evaluated by Student's t test. Results : Contrast filled dynamic CT scan was useful method for the evaluation of dynamic patency of the olfactory cleft. Paranasal CT scan of the all anosmic patients showed dynamic reflux of contrast media in olfactory cleft on valsalva maneuver. For the largest cross-sectional area and great height, the difference in olfactory bulb size between normal volunteers and patients was statistically significant(p<0.001) in MRI study. Conclusion : Posttraumatic anosmia was completely evaluated by olfactory testing, sinoscopy, and contrast filled CT scan for differentiation between conductive type and neurogenic type. Neurogenic anosmia was confirmed by perfect localization with MRI study.