A 69-year-old male with pneumonia presented with altered mental status. The CT scan indicated: Multiple foci of intracranial air in a venous distribution, bilateral internal jugular veins, cavernous sinuses, and superficial soft tissues. No other abnormality was detected. What can be the diagnosis for this patient?

What can be the etiologies for such condition? *This case is from Docplexus editorial team for educative purpose only. Source: University Of Rochester Medical Centre