PMC6041406_01
Case 1. (A) Sagittal T2-weighted MRI image, showing a sharply-demarcated hyperintense lesion in the caudal cerebellar hemisphere and vermis. There is no apparent mass effect. (B) Transverse T2 FLAIR MRI image (at the level of the lesion seen in (A), patient's left sided is on the right hand side of the picture). The lesion is wedge-shaped, hyperintense and confined to the right cerebellum. (C) Transverse diffusion-weighted image (DWI) and (D) corresponding apparent diffusion coefficient (ADC) MRI images. Patient's left sided on R hand side of the picture. The arrowheads highlight the lesion, which has restricted diffusion (hyperintensity) on the DWI and a reduced ADC (hypointensity), typical of an acute infarct.
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F1
Tokyo) was performed 24 h after the onset of neurological signs. A single, sharply-demarcated focal cerebellar lesion was identified in the caudal third of the right cerebellar hemisphere and lateral medulla oblongata (Figure 1A). The lesion was isotense on T1-weighted images, and hyperintense on T2-weighted images (Figures 1A,B) and T2 FLAIR images. Diffusion-weighted images (DWI) showed a well-demarcated area of uniform hyperintensity with a corresponding area of reduced diffusion (hypointensity) on an apparent diffusion coefficient (ADC) map (Figures 1C,D).
PMC6041406_02
Case 2. MRI images show a focal well-defined hyperintense lesion on T2-weighted (A) and T2 FLAIR sequences (B) caudally in the left cerebellar hemisphere. Molecular diffusion is restricted on DWI images (C) and corresponding ADC map (D). Patient's left sided is on the right hand side of the picture. Arrowheads underline the lesion described.
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F2
Brain MRI showed a focal well-defined hyperintense lesion on T2-weighted (Figures 2A,B) and T2 FLAIR sequences in the caudal left cerebellar hemisphere. ADC map (Figures 2C,D). A thin rim of contrast enhancement was seen around the margin of a cerebellar folium.
PMC6041406_03
Case 3. SAG FSE T2 (A) and TRANS FSE T2 (B) MRI images. A poorly defined area of homogeneously increased T2 signal intensity (arrowheads) compared to normal cerebellar gray matter, measuring approximately 8 x 13 x 6 mm in size, is affecting the caudal aspects of the cerebellar vermis and right cerebellar hemisphere. In (B), patient's left sided is on the right hand side of the picture.
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F3
T2 FLAIR signal hyperintensity compared to normal cerebellar gray matter, affecting the caudal aspect of the cerebellar vermis and right cerebellar hemisphere was observed (Figures 3A,B). This lesion had a low signal in T1-weighted images, and there was no abnormal contrast enhancement. There was no signal void observed on T2* weighted images.