Table 3.

Information extraction error categories

Error categories	Definition	Example
Class 1	Qualifier-based errors (e.g., temporal, conditional, benign)	Benign calcifications, previously described mass
Class 2	Certainty-based errors (i.e., ambiguous)	Area of question of architectural distortion
Class 3	Indication-based errors	Palpable mass
Class 4	Exclusions (i.e., previously unspecified exclusions)	Lymph node
Class 5	Extraction errors (e.g., co-reference, negation)	Previously described finding is not suspicious