Abstract  Osteomas of the cranial sinuses are rare, benign bony tumors that can be complicated by the formation of an intracranial pneumatocele.
If not treated promptly, a pneumatocele can lead to abscess formation, meningitis, or ventriculitis. In the present case,
an intracerebral pneumatocele was formed when an 18 cm3 osteoma breached the posterior wall of the frontal sinus creating a one-way valve through which air could enter the intracranial
cavity. The patient presented after forceful sneezing with nonspecific symptoms of headache, nausea, and vomiting. CT demonstrated
a frontal collection of loculated air with mass effect within the left cerebral hemisphere. A partly mineralized mass occupied
the left superior nasal ethmoid sinus and left frontal sinus. Of inter...

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