Figure 7b.

Inattentional blindness and hindsight bias. A child presented to the emergency department with a limp and denied a history of trauma. (a, b) Frontal (a) and right frog-leg lateral (b) radiographs show a normal pelvis and right hip, as interpreted by the radiologist. (c, d) Axial (c) and coronal (d) nonenhanced CT images of the pelvis show a pencil (arrows), which was present due to self-inflicted trauma. This finding was outside the traditional search pattern and demonstrates inattentional bias during radiographic review. The radiologist interpreting the CT images (c, d) could not believe the finding was missed during the initial review, which is an example of hindsight bias.