A patient with a significant organic memory impairment, when asked what she did yesterday, confidently and elaborately describes attending a family celebration that did not take place and that bears no resemblance to anything she is known to have previously experienced. Before revealing the answer: is this cryptamnesia?

No, this is more consistent with confabulation than with cryptamnesia. The described event appears to be genuinely invented, with no indication that it corresponds to anything she actually experienced or encountered before, arising specifically in the context of an underlying organic memory impairment. Cryptamnesia would instead require that the reproduced content actually was previously encountered somewhere, even if unknowingly, which is not indicated here — this is invented content filling a genuine memory gap, the hallmark of confabulation.