Angiograms were negative, in 81 out of 551 patients with spontaneous subarachnoid hemorrhage (SAH), in whom an aneurysm was suspected, the angiogram was negative. One to 4 weeks later 51 patients were submitted to a second angiogram, which revealed an aneurysm in 6 cases. Three of these patients had a second hemorrhage.
In all cases diffuse bleeding with involvement of the fronto-basal interhemispheric fissure was present on CT. Four aneurysms were of the Anterior Communicans Artery (ACoA), and 2 of the carotid siphon. The reason for the false negative angiograms and the usefulness of a control angiogram are discussed.
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