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Pontomesencephalic Atrophy and Postural Instability in Wilson Disease.

J Kalita1, S Naik2, S K Bhoi3

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Summary

The MR Parkinsonism index is elevated in Wilson disease due to midbrain atrophy. This increase correlates with greater neurologic severity and abnormal postural reflexes in patients.

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Area of Science:

  • Neurology
  • Radiology
  • Neuroimaging

Background:

  • The MR Parkinsonism index aids in distinguishing Parkinson disease and multisystem atrophy from progressive supranuclear palsy.
  • Neurologic Wilson disease commonly involves the pons and midbrain, but its MR Parkinsonism index has not been studied.
  • This study investigates the MR Parkinsonism index in neurologic Wilson disease.

Purpose of the Study:

  • To evaluate the MR Parkinsonism index and its components in patients with neurologic Wilson disease.
  • To correlate these indices with clinical severity and postural reflex abnormalities.
  • To compare findings in Wilson disease patients with healthy controls.

Main Methods:

  • Thirteen patients with neurologic Wilson disease and 6 healthy controls were included.
  • MR imaging was performed using a 3D BRAVO T1 sequence.
  • The MR Parkinsonism index and its components were measured and compared between groups, including stratification by postural reflex status.

Main Results:

  • Patients with Wilson disease showed reduced midbrain area compared to controls (P = .002).
  • An elevated MR Parkinsonism index and pons-to-midbrain ratio were observed in Wilson disease patients with abnormal postural reflexes compared to controls.
  • Abnormal postural reflex correlated with higher Burke-Fahn-Marsden scores and neurologic severity grades (P = .04).

Conclusions:

  • Increased MR Parkinsonism index in Wilson disease is primarily attributed to midbrain atrophy.
  • The MR Parkinsonism index in Wilson disease correlates with neurologic severity and the presence of abnormal postural reflexes.