Clinical and pathological characteristics of primary progressive aphasia and frontal dementia

The recently described conditions of primary progressive aphasia and frontal lobe dementia overlap clinically and pathologically to a considerable extent with each other and with clinical and pathological descriptions of Pick's disease. Our clinical and neuropathological experience is summarized, leading us to the conclusion that the degree of overlap justifies the concept of "Pick complex" to include, in addition to the above, corticobasal ganglionic degeneration and some instances motor neuron disease with dementia.