Computed tomography (axial view) of the brain demonstrating extensive, right greater than left, frontal pneumocephalus (solid white arrow), subarachnoid (yellow dotted arrow) and bilateral frontal ventricular horn gas (white dotted arrow) without midline shift. The CT also demonstrates minimal subdural blood (yellow arrow) along the inferior-anterior margin of the interhemispheric fissure adjacent to the gyrus rectus.