Table 1.

Neuroimaging abnormality patterns in three variants of primary progressive aphasia for imaging-supported diagnosis (see: [1]).

Variant	MRI		SPECT/PET
Non-fluent	Predominant left posterior fronto-insular atrophy	or	Predominant left posterior fronto-insular hypoperfusion or hypometabolism
Semantic	Predominant anterior temporal lobe atrophy	or	Predominant anterior temporal hypoperfusion or hypometabolism
Logopenic	Predominant left posterior perisylvian or parietal atrophy	or	Predominant left posterior perisylvian or parietal hypoperfusion or hypometabolism

MRI – magnetic resonance imaging; PET – positron emission tomography; SPECT – single-photon emission computerized tomography.