Table 4.

Observations related to criteria failure for possible behavioural variant FTD (n = 19/137)

Observations related to criteria failure for possible bvFTD	Number of cases
Early severe amnesia/episodic memory impairments, diagnosed as Alzheimer’s disease at presentation	6
Cases with 2/6 diagnostic features at presentation, diagnosed as bvFTD or ‘non-amnestic MCI’ either at initial (n = 4) or last evaluation (n = 2) (two cases had ‘don’t know’ responses in 3/6 diagnostic features).	6
Unusual pathology: AGD (n = 1), AGD and TPSD (n = 1), AGD and TDP (n = 1)	3
Prominent delusions, diagnosed as depression/delusional disorder (n = 1), bvFTD (n = 1) at presentation	2
Presented with spatial disorientation, diagnosed as dementia NOS at presentation (bvFTD at last visit)	1
PGRN mutation with known family history, diagnosed as bvFTD at presentation (only one feature rated as ‘yes’)	1

AGD = argyrophilic grain disease; MCI = mild cognitive impairment; PGRN = progranulin; TPSD = tangle predominant senile dementia.

bvFTD = behavioural variant FTD.