TABLE A1.

Review of 12 False-positive Radiology Reports Where IDEAL-X in Controlled Vocabulary Mode Identified a Venous Thromboembolism When None was Present on Manual Review

Frequency	False-positive Reason	Example
6*	Description of radiology study limitations	“respiratory motion limits evaluation for pulmonary embolism,” “small emboli in the segmental and subsegmental arteries can be missed”
3*	Description of superficial vein	“superficial venous thrombosis of the left basilic vein”
1*	Recommendation for additional testing	“nuclear study can be performed as clinically indicated for evaluation of pulmonary emboli”
1	Contradictory/ambiguous descriptions	“findings can be seen with … sequela of chronic pulmonary embolism, although there is no direct evidence of chronic pulmonary embolism”
1	Radiology report syntax typo	“1. no pulmonary embolism” (no space between “1.”+“no”)

^*Ten false-positives could be averted in the future by adding these learned terminology to existing controlled vocabulary in IDEAL-X.