FIGURE 1. Initial pre-contrast brain CT and brain CTA. Initial brain CT of a 58-year-old man after a crushing injury to the face. Numerous areas of air density were noted in almost the entire intracranial cerebrospinal fluid space (A, B). Central skull base and right zygomatic fractures (arrows) and air fluid level in the ethmoid and sphenoid sinus on brain CT with the bone algorithm are shown (C, D). Focal air density (arrow) in the right jugular bulb is shown (D). No arterial abnormalities were found on CTA (E). Retrospectively, no contrast filling was found in the right jugular bulb compared to the left on source images of CTA (F).

CT: computed tomography, CTA: computed tomography angiography.