Inclusion Criteria:

  • Chest computed tomography report contained [‘nodule’ OR ‘nodules’] AND [‘follow-up’ OR ‘repeat’]
  • Age ≥ 35 years
  • Domicile in Olmsted County, MN

Exclusion Criteria:

  • Age < 35 years
  • Domicile outside of Olmsted County, MN
  • Prior history of malignancy other than non-melanoma skin cancer
  • Prior history of lung transplantation
  • Prior cross-sectional imaging revealed pulmonary nodule
  • Detected nodule is outside of the lung
  • Patient died of unrelated causes within the recommended follow-up interval
  • Subsequent CT chest earlier than Fleischner recommendation for a clinical reason other than the pulmonary nodule(s)
Table 1: Inclusion and Exclusion Criteria.