The various disease of the aortic arch and its branches are dealt with and the individual parts of the diagnostic equipment critically examined from the point of view of the clinical neurologist. Peculiarities of differential diagnosis and questions of risk are presented and discussed. Possibly misleading vascular sounds were found in an angioma in the occipital region. The neurologist views with scepticism cervical ribs and gaps in the scalenus as pathogenic factors. Early diagnosis is important in carotid stenosis. The increased angiographical risk in vascular diseases requires informed willingness for operation on the part of the patient. Finally, the expected extent of clinical success of the operation must be weighed against the purely "vascular cosmetic" success.
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