Subarachnoid Osteoma of the Right Frontal Lobe.

Abstract

Intracranial osteoma arising from nonosseous tissue and surrounded by brain parenchyma is extremely rare. We report an intracranial osteoma surgical case with no heterotopic ossification. A 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. In 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.