Increased metabolic activity highlighted by positron emission tomography/computed tomography in the wall of the dissected ascending aorta in a patient with Horton disease.

H orton disease or giant-cell arteritis (GCA) is a chronic systemic vasculitis involving typically medium and large arteries. Giant-cell arteritis is a panarteritis characterized by a granulomatous inflammation, with lymphocytes, macro-phages, and multinucleated giant cells related to autoimmune T-cell reactivity. 1 Compared with conventional imaging tools… CONTINUE READING