Entorhinal Cortex Atrophy grading
0: Normal volume of the entorhinal cortex and parahippocampal gyrus
1: Mild atrophy with widening of the collateral sulcus
2: Moderate atrophy with detachment of the entorhinal cortex from the cerebellar tentorium ("tentorial cleft sign")
3: Pronounced atrophy of the parahippocampal gyrus and a wide cleft between entorhinal cortex and the cerebellar tentorium
References
The ERICA Score: An MR Imaging–based Visual Scoring System for the Assessment of Entorhinal Cortex Atrophy in Alzheimer Disease 2018 Jul;288(1):226-333
doi:
10.1148/radiol.2018171888
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