Semantic dementia belongs to the frontotemporal dementia (FTD) family of disorders. It has a unique combination of clinical and imaging abnormalities.

Semantic dementia: a unique clinicopathological syndrome
Semantic dementia (SD), one of the main clinical variants of frontotemporal dementia, presents a unique combination of clinical and imaging abnormalities. We describe the epidemiological, cognitive, a
http://www.ncbi.nlm.nih.gov/pubmed/17945154