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Negation is commonly seen in clinical documents [Chapman et al., 2001a] ”In clinical reports the presence of a term does not necessarily indicate the presence of the clinical condition represented by that term. In fact, many of the most frequently described findings and diseases in discharge summaries, radiology reports, history and physical exams, and other transcribed reports are denied in the patient” [Chapman et al., 2001b, page. 301].
John D. Kelleher and Brian Mac Namee, "A Review of Negation in Clinical Texts", Dublin Institute of Technology School of computing Technical Report, SOC-AIG-001-08. (2008)