Abstract

Radiographic calcification of the carotid artery siphon is frequently (75.6%) encountered in healthy, elderly males. Based on appearance, this calcification may be intimal or medial. Various radiographic-pathologic investigations support this subdivision. Patients with intimal carotid siphon calcification have diminished cerebral blood flow values (52.1 ml/100 g/rnin.) while subjects with medial calcification have values (60.6 ml/100 g/min.) closely resembling those found in the optimally healthy elderly (57.9 ml/100 g/min.). Thus, radiographic carotid siphon calcification acquires a new and more selective physiologic significance and potentially a more meaningful clinical value.

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