title: Pneumocephalus from a frontal-ethmoid neurilemoma.
abstract: A 68-year-old man had memory lapse, character change, and unsteady gait. Skull films disclosed a spontaneous pneumocephalus with air in both ventricles. A dense, bony lesion in the right ethmoid area was thought to be an osteoma, a not infrequent cause of dural erosion. The bony lesion, however, proved to be an osteoid reaction around a primary neurilemoma. Neurilemomas arising in the paranasal sinuses are uncommon tumors and, to the best of our knowledge, this is the first reported case of a patient with a neurilemoma who had pneumocephalus. The lesion was excised through a Lynch approach, and the patient has remained free of tumor for the past two years.
mesh_terms: D000368:Aged; D005005:Ethmoid Sinus / Q000000981:diagnostic imaging*; D005626:Frontal Sinus / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D009442:Neurilemmoma / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D010255:Paranasal Sinus Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D011007:Pneumocephalus / Q000209:etiology*; D011859:Radiography