Case findings are consistent with skull vault hemangioma (also known as cavalrial hemangioma).

Learning points:

• skull vault hemangiomas are benign, indolent vascular neoplasms affecting the skull diploë, with frontal and parietal bones commonly implicated
• CT findings consistent with skull vault hemangioma include:
  • expansile bone lesion with thin borders
  • "sun-ray/burst" pattern of trabecular internal striation radiating from a common center
• management may involve radiotherapy, surgical resection, and/or embolization