case_images: PMC8443378_01
case_images: PMC8443378_02
case_images: Axial (a) and midsagittal (b) noncontrast head CT at presentation shows bilateral cerebellar hemisphere hypoattenuation (low density) with swelling (arrows). There is inferior herniation of the cerebellar tonsils with crowding at the foramen magnum (dashed arrow).
case_images: CRICC2021-9449565.001.jpg
case_images: PMC8443378_02_CRICC2021-9449565.001.jpg
case_images: fig1
case_images: A head CT was performed, and he was found to have bilateral cerebellar hemisphere hypoattenuation with acute swelling on computed tomography (Figure 1).