PMC9894729_01
T1 series of magnetic resonance imaging (MRI)
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FIG1
Magnetic resonance imaging (MRI) of his brain displayed a T1 isointense (Figure 1), T2 hypointense (Figure 2) ring-enhancing lesion in the left cerebellar hemisphere, with restricted diffusion, and surrounding vasogenic edema resulting in mass effect over the fourth ventricle, left cerebellar peduncle, and pontocerebellar cistern causing mild hydrocephalus.
T2 series of magnetic resonance imaging (MRI)
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FIG2
Magnetic resonance imaging (MRI) of his brain displayed a T1 isointense (Figure 1), T2 hypointense (Figure 2) ring-enhancing lesion in the left cerebellar hemisphere, with restricted diffusion, and surrounding vasogenic edema resulting in mass effect over the fourth ventricle, left cerebellar peduncle, and pontocerebellar cistern causing mild hydrocephalus.
Brain biopsy demonstrating lymphoplasmacytic infiltrate
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FIG3
Pathology was sent to New York-Presbyterian Columbia University Irving Medical Center due to atypical lymphoplasmacytic infiltrates seen in pathology (Figure 3).