PMC9912852_01
Axial DWI and ADC images A and B showed diffusion restriction in the splenium of the CC (long arrows showing high signal intensity on DWI on image A and low signal intensity on ADC on image B) with a high signal intensity on the sagittal FLAIR on image C (arrowhead showing high signal intensity in the splenium) and a high signal intensity on the axial T2 on image D (short arrow showing high signal intensity in the splenium) suggesting a CLOCCS. Sagittal FLAIR on image E (arrowhead showing the disappearance of the high signal intensity in the splenium) and axial T2 on image F (short arrow showing the disappearance of the high signal intensity in the splenium) showed a complete resolution of the CLOCCS signs one week later.
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F1
Diffusion restriction in the splenium of the corpus callosum was seen with a slightly high signal intensity on FLAIR (Figure 1A-D).
Axial T2 on image A showed an associated cerebellitis with a slight high signal intensity of the parenchyma and a mass effect on the fourth ventricle and on the basal cisterns. Axial T2 on image B depicted a decrease of the cerebellitis signs one week later with a normalization of the signal intensity of the parenchyma and a decrease of the mass effect on the fourth ventricle and on the basal cisterns.
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F2
Magnetic resonance imaging (MRI) of the brain performed on the same day depicted a cerebellitis with edema and diffuse and symmetric T2/FAIR high signal intensity zones of the cerebellum with gadolinium enhancement and massa effect on the fourth ventricle (Figure 2A).