Pneumocephalus

**Definition:** Presence of air or gas within the intracranial cavity (e.g., epidural space, subdural space, intracerebral, etc.) which may result from traumatic injuries, fistulous tract formation, erosions of the skull from NEOPLASMS or infection, NEUROSURGICAL PROCEDURES, and other conditions.

**Tree numbers:** - C10.228.140.199.700 - C10.228.806 - C10.900.300.087.700 - C26.915.300.200.650

**Synonyms:** - Cranial Airocele - Cranial Pneumocyst - Intracranial Gas