Pontomesencephalic Atrophy and Postural Instability in Wilson Disease

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.