Post-traumatic intra-orbital pneumatocele—a rare cause of unilateral exophthalmos

This case represents a form of extracranial, intra-orbital pneumatocele arising from a repaired fracture of the maxillary sinus. It is of interest as a radiographic curiosity, but also important as another cause of unilateral exophthalmos. The cause of the proptosis can be easily detected since routine films, supplemented by tomography, will allow the diagnosis to be readily established.