• Xiangyuan Cao, Yida Wang, and Yi Jin.
• Department of Neurosurgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China.
• World Neurosurg. 2020 Nov 1; 143: 415-418.

BackgroundIntracranial osteoma arising from nonosseous tissue and surrounded by brain parenchyma is extremely rare. We report an intracranial osteoma surgical case with no heterotopic ossification.Case DescriptionA 32-year-old woman presented with headache, vertigo, and weakness. Preoperative neuroimaging revealed a spherelike, calcified intracranial lesion in the right frontal region. The bone-hard mass was completely removed by right frontal craniotomy; adhesion and invasion of the skull inner plate and dura were not found. The subarachnoid lesion was surrounded by right middle frontal gyrus, and the blood supply was from branches of pia mater. Postoperative histologic examination suggested an extensive intracranial ossification. At 6-month follow-up, the patient demonstrated a good recovery without any neurological deficits and no recurrence.ConclusionsIn this rare surgical case of subarachnoid osteoma, comprehensive preoperative neuroradiologic examinations, accurate surgical management of adjacent brain tissue, and vessel protection were the cornerstones of successful resection.Copyright © 2020 Elsevier Inc. All rights reserved.

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