Fig. 1

Brain magnetic resonance imaging performed at the previous hospital and our hospital. For the previous hospital, images at the time of admission (A–D) and 49 days after admission (E) are shown. For our hospital, images at the time of admission (F–J) and 25 (K–O), and 42 (P–T) days after admission are shown. Ventricular debris appeared as hypointense areas in the cerebrospinal fluid (CSF) on T2-weighted (A) and apparent diffusion coefficient (ADC) (C) images and as hyperintense areas in the CSF on the corresponding diffusion-weighted image (DWI) of the left occipital horn (B). Slight ependymal enhancement was found in the right occipital horn on the enhanced T1-weighted image (D). The hyperintensity in the left occipital horn was no longer apparent on DWI (E). T2-weighted (F) and ADC (I) images showed decreased intensity in the CSF in the occipital horn, whereas the corresponding fluid attenuation recovery (G) and DWI (H) images showed increased intensity with an enhanced ventricular line (arrow, J). The abnormal intensity in the bilateral occipital horns was reduced (K–N) but the ependymal enhancement was still obvious (arrow, O). The abnormal intensity had disappeared (P–S) and no enhancement was observed (T)