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The incomplete hippocampal inversion (IHI) is an atypical anatomical patternof the hippocampus. However, the hippocampus is not a homogeneous structure, asit consists of segregated subfields with specific characteristics. While IHI isnot related to whole hippocampal volume, higher IHI scores have been associatedto smaller CA1 in aging. Although the segmentation of hippocampal subfields ischallenging due to their small size, there are algorithms allowing theirautomatic segmentation. By using a Human Connectome Project dataset of healthyyoung adults, we first tested the inter-reliability of two methods forautomatic segmentation of hippocampal subfields, and secondly, we explored therelationship between IHI and subfield volumes. Results evidenced strongcorrelations between volumes obtained thorough both segmentation methods.Furthermore, higher IHI scores were associated to bigger subiculum and smallerCA1 volumes. Here, we provide new insights regarding IHI subfields volumetry,and we offer support for automatic segmentation inter-method reliability.

Incomplete hippocampal inversion and hippocampal subfield volumes: Implementation and inter-reliability of automatic segmentation