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Brainstem infarctions with normal MRI.

M Krasnianski1, A Lindner, S Zierz

  • 1Department of Neurology, University Halle-Wittenberg, Ernst-Grube-Str. 40, D-06097 Halle (Saale), Germany. sekretariat.neurologie@medizin.uni-halle.de

European Journal of Medical Research
|April 16, 2002
PubMed
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Brainstem infarcts with normal MRI scans can still present with classic symptoms. Clinical diagnosis is crucial, especially for midbrain and pons lesions, as MRI may not detect all ischemic events.

Area of Science:

  • Neurology
  • Radiology
  • Neuroimaging

Background:

  • Brainstem infarctions are typically diagnosed using CT or MRI.
  • Limited research exists on brainstem infarcts presenting with normal imaging results.

Purpose of the Study:

  • To analyze clinical symptomatology in patients with brainstem infarcts and normal MRI.
  • To determine the frequency of MRI-negative brainstem infarctions based on lesion location.

Main Methods:

  • Studied 30 consecutive patients with acute ischemic brainstem lesions and persistent symptoms (>10 days).
  • Focused on 8 patients with normal MRI, using clinical and electrophysiological criteria to localize lesions.
  • Correlated clinical symptoms with classical alternating syndromes.

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Main Results:

  • Eight out of 30 patients (26.7%) showed normal MRI despite clinical signs of brainstem infarction.
  • Lesions in MRI-negative cases were located in the medulla oblongata (3), pons (2), and midbrain (3).
  • Clinical symptoms corresponded to pathognomonic alternating syndromes (Wallenberg, Avellis, Jackson, Millard-Gubler, Weber).

Conclusions:

  • A normal MRI does not exclude the diagnosis of brainstem infarction.
  • Clinical diagnosis remains vital, particularly for lesions in the midbrain and caudal pontine tegmentum.
  • MRI-negative brainstem infarcts generally have a favorable prognosis with symptom resolution within weeks.