PMC9062945_01
MRI of the 38-year-old male patient who presented with slowly progressive weakness of the upper and lower extremities. Axial SWI sequence of the brain reveals symmetric gyriform susceptibility exclusively along the posterior cortex of the precentral gyrus in keeping with the "motor band sign."
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F1
3T-MRI of the brain revealed symmetric susceptibility artifacts on the susceptibility weighted imaging (SWI) sequence along the posterior aspects of the precentral gyri [Figure 1].
MRI of the 38-year-old male patient who presented with slowly progressive weakness of the upper and lower extremities. Axial T1 (a-c) and axial T2 (d-f) images of the brain reveal symmetric hyperintensity in the centra semiovale (a and d), coronae radiatae (b and e) and the posterior limbs of the internal capsules (c and f), along the expected course of the CSTs. Coronal T2 image (g) reveals the entire extent of the signal abnormality.
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F2
T1, and T2 hyperintense signal abnormality was also observed extending from the precentral gyri to the cerebral peduncles, across the centrum semiovale, corona radiata, and posterior limbs of the internal capsules i.e., the expected course of the corticospinal tracts (CST) [Figure 2]. These signal changes were not associated with restricted diffusion.
MRI of the 38-year-old male patient who presented with slowly progressive weakness of the upper and lower extremities. Axial T1 images (a-d) of the cervical spine demonstrate symmetric T1 hyperintensity along the anterolateral columns of the cervical cord. Note the absence of cord swelling or atrophy. T1 hyperintensity within the perimedullary CSF is artifactual (attributed to "entry slice phenomenon"). Sagittal T1 (e) reveals the entire extent of the signal abnormality.
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F3
On evaluation of the cervical spine, further extension of the T1 hyperintense signal abnormality was noted along the anterolateral aspects of the cervical cord along the expected course of the CST, however, there was no convincing T2 signal abnormality [Figure 3].