Example of the most prevalent diagnostic category. A 23-year-old female patient diagnosed with alveolar hemorrhage during the investigation of vasculitis, which presented as areas of ground-glass attenuation with central or peribronchovascular consolidation on HRCT. All raters agreed on the diagnostic category of HRCT features most consistent with a non-IPF diagnosis. Four of the five raters included alveolar hemorrhage as one of the diagnostic hypotheses.