Figure 2.

(A) Anatomic classification of hippocampal lesions after Szabo et al.¹¹ Four distinct patterns of hippocampal diffusion lesions can be identified depending on the extent of the lesion, including the complete hippocampus (a), the lateral (b) and partial sections of the hippocampus (c; posterior or anterior, the latter corresponding to the anterior choroidal artery), and small, focal dot-like lesions in the lateral hippocampus (d) that correspond to the CA1 area. The lesion pattern of types b and d corresponds to a selective affection of the CA1 region. The distribution of each lesion is presented as a schematic drawing (top row) and as a DWI hyperintense acute lesions (bottom row) on axial orientation. Bottom row indicates the neurologic diseases in which these different spatial lesion patterns can be observed. Only diffusion changes in CA1 were studied. (B) Bar graph illustrating the distribution of the different lesion pattern affecting the hippocampus.