Table 1.

Exclusion Criteria in Patients that did not Fulfill the 1998 Criteria.^a

	Possible bvFTD	Probable bvFTD
Diagnostic exclusion features
Early, severe amnesia	2	1
Spatial disorientation	2b	2
Myoclonus	0	2
Brain imaging: predominant postcentral brain atrophy or hypoperfusion/hypometabolism deficit	2	0
Relative diagnostic exclusion features
Typical history of chronic alcoholism	1	1

Abbreviation: bvFTD, behavioral variant of frontotemporal dementia.

^aData express the number of patients that present the feature. Some patients may have more than 1 exclusion feature.

^bOne patient with an expansion in C9orf72 gene had spatial disorientation at the onset of the disease.