Table 2:

Reference documentation and conspicuity of proved lesions in positive CT examinations with imaging findings corresponding to cause of acute neurologic deficit (n = 42)

Target Diagnosis	No. of Imaging Findings with Target Diagnosis	No. with Reference Criterion (Nonexclusive List)	Ranking of Conspicuity Scoresa (Mean) (SD)
Infarct	29	Clinical confirmation of corresponding deficit = 29	2.10 (0.76)
		Progression/confirmation on another imaging study = 23
		Confirmation at surgery = 0
Mass	25	Clinical confirmation of corresponding deficit = 22 Progression/confirmation on another imaging study = 21 Confirmation at surgery = 2	2.80 (0.70)
Extra-axial hemorrhage	10	Clinical confirmation of corresponding deficit = 10 Progression/confirmation on another imaging study = 3 Confirmation at surgery = 0	2.60 (0.66)
Intra-axial hemorrhage	6	Clinical confirmation of corresponding deficit = 6 Progression/confirmation on another imaging study = 2 Confirmation at surgery = 0	2.67 (0.47)

^aPlease see Materials and Methods. In brief, conspicuity scores: 1, minimally evident; 2, subtle; 3, distinct focal abnormality; 4, obvious.