What types of skull fractures are most commonly associated with pneumocephalus, and what are the key imaging features to identify it?

Pneumocephalus is most commonly associated with compound skull fractures and fractures involving the paranasal sinuses. Key diagnostic features include the presence of air within the cranial cavity, often seen as a 'Mount Fuji sign' on CT imaging, indicative of tension pneumocephalus. Clinically, it is important to differentiate true pneumocephalus from mimickers such as artifact or post-surgical changes. A common pitfall is missing small amounts of intracranial air on non-contrast studies, so a high index of suspicion is necessary in the context of trauma.