• Spontaneous extracranial pneumatoceles unassociated with trauma are rare. We report a case of spontaneous extracranial mastoid pneumatocele associated with exuberant pneumatization of the calvarium and mastoid. The patient presented with a compressible bulge over the base of the zygoma and superior to the pinna. Surgical exploration demonstrated a large air sac in continuity with nontraumatic bony defects of the tympanosquamous and tympanomastoid sutures.
(Arch Otolaryngol Head Neck Surg 1989;115:107-108)
Levenson MJ, Ahuja G, Bergeron T. Spontaneous Extracranial Pneumatocele Associated With Mastoid Hyperpneumatization. Arch Otolaryngol Head Neck Surg. 1989;115(1):107–108. doi:10.1001/archotol.1989.01860250109038