A 48-year-old woman presented with a several-year history of bilateral painful swelling on her forehead. Computed tomography revealed osteolytic lesions with dot-like high-density areas on both sides of the frontal bone. Based on these characteristic findings, the patient was diagnosed with venous malformations. En bloc resection of these lesions, including the perilesional bone, was performed. Following resection of the lesions, residual bone defects were reconstructed using autologous bone harvested from the parietal bone.
Histopathological examination confirmed that the bilateral frontal bone lesions were venous malformations. No recurrence of the cranial deformity or resorption of bone grafts was observed 2 years postoperatively.
Primary intraosseous venous malformations are uncommon and account for 0.7% to 1.0% of all bone neoplasms. Lesions involving the cranial vault are rare, constituting only 0.2% of all bone tumors. Although the frontal bone is a common site of intraosseous venous malformations, multiple lesions involving the skull are unusual. In this patient, we successfully used autologous bone as reconstruction material to reduce the risk of infection.
