A patient recalls the day of a serious accident in extraordinarily vivid, almost hallucinatory detail, describing sounds, smells, and images with striking intensity; on checking, her account matches the documented facts closely. What is this?

This is hyperamnesia: a memory that is unusually vivid, detailed, and intense compared with ordinary recall, exactly as described, with accuracy confirmed on checking. It is not confabulation, since hyperamnesia differs from confabulation and other paramnesias in that the memory content, while unusually vivid, is not necessarily false — accuracy can vary independently of vividness, and here the account has been confirmed accurate. It is not a flashback specifically, which is a sudden, intrusive re-experiencing rather than a memory recalled voluntarily as being asked about here. And it is not deja vu, which is a false sense of familiarity with a new experience, not heightened vividness of a genuine past memory.