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Table 4 Negative CT angiography (CTA) cases

From: Cerebral aneurysm exclusion by CT angiography based on subarachnoid hemorrhage pattern: a retrospective study

Initial CT Hemorrhage Pattern of Negative CTA Cases Aneurysm Found on Catheter Angiography (CTA False Negatives) No Aneurysm Found on Catheter Angiography (CTA True Negatives) Negative Predictive Value
Aneurismal 6 37 84.1%
Perimesencephalic 0 19 100%
No hemorrhage 0 16 100%
  1. Distribution based on the initial CT and negative predictive values of the different hemorrhage groups