There was a 3-cm full-thickness defect on the parietal bone caused by the lesion. However, intraoperative diagnosis was a vascular malformation. The patient was operated under local anaesthesia with a provisional diagnosis of a trichilemmal cyst. On physical examination, it was observed that the hair density on the mass was decreased, the mass had a soft consistency, and there was no pain on palpation.
A 25-year-old male patient was admitted to the clinic with a mass on the parietal bone. In this case report, we aimed to present a rare case of intraosseous vascular malformation causing a large lytic area in the parietal bone. Primary intraosseous vascular malformations (PIVMs) are rare intraosseous lesions, accounting for approximately 0.5–1% of all intraosseous tumours.
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