Fig. 4.

Case “NAHT2.” 2 years old. a FLAIR. b T2*. Anamnesis (not available for the neuro/radiologists): hit by a car as a pedestrian the day before. MRI findings: a coup injury with soft tissue edema on the left side (a and b, curved arrow) with a contrecoup on the opposite side due to abrupt deceleration of the head. The rapidly changing velocities within the skull may stretch and tear small bridging veins. Much more common than epidural hemorrhages, subdural hemorrhages (a, black straight arrow) generally result from shearing injuries due to various rotational or linear forces. Note on T2* the diffuse axonal injury (b, white straight arrow) with a characteristic distribution: typically located in the corpus callosum, white matter, and gray-white matter junction on the left frontal lobe. All neuroradiologists were able to rule out pAHT but none of the non-neuroradiologists