MedGen

Any structural anomaly of the hippocampus, [from HPO]

This term applies to a family member in whom the diagnosis that is the primary focus of investigation is excluded. [from HPO]

Any structural anomaly of the limbic system, a set of midline structures surrounding the brainstem of the mammalian brain, originally described anatomically, e.g., hippocampal formation, amygdala, hypothalamus, cingulate cortex. Although the original designation was anatomical, the limbic system has come to be associated with the system in the brain subserving emotional functions. As such, it is very poorly defined and doesn't correspond closely to the anatomical meaning any longer. [BirnLex]. [from HPO]

An impairment of memory as manifested by a reduced ability to remember things such as dates and names, and increased forgetfulness. [from HPO]