Table 1.

Mentionlevel annotation schema; Bolded = terms indicating fluid collection; italics= contextual terms indicating anatomic location, negation, uncertainty, historicity, and indication.

Class Name	Definition	Examples
Positive Evidence of Fluid Collection	A positive mention of fluid collection mentioned as potentially occurring at some point in time in the same sentence as a relevant anatomic location.	“Fluid collection is seen in the abdomen.”
Negated Evidence of Fluid Collection	A clear statement ruling out the possibility of fluid collection.	“There is no evidence of fluid collection in the abdomen.”
Indication for Exam	A phrase indicating that the purpose of the exam is to check for fluid collection.	“PURPOSE OF EXAM: Rule out abscess.”
Anatomy	A part of the body in the GI tract that occurs in the same sentence as a mention of fluid collection.	“Hematomas are seen around in the right lower quadrant.”