10086- MET-8 A CASE OF METASTASIS OF LUNG CANCER TO INTRACRANIAL MENINGIOMA

Abstract INTRODUCTION Meningiomas are the most common benign tumors, and are supplied with nutrients from various blood vessels, and have a very rich cerebral blood flow, making them a potential target for systemic cancer metastasis. We report a case of small cell lung cancer metastasis to a meningioma. CASE A 74-year-old man. He had been treated for small cell lung cancer and was under observation. He had gradually lost appetite one month ago and was hospitalized at his previous hospital. A head CT scan revealed a suspected brain tumor, and he was referred to our hospital for treatment. At the initial visit, he only had mild consciousness disorder. Head CT scan showed a tumorous lesion of about 5 cm in the right frontal region, adjacent to the dura mater, with surrounding cerebral edema. Brain MRI showed areas of uniform contrast and areas of poor contrast due to bleeding in the same area. Although the consciousness disorder improved with the administration of steroids, the tumor did not shrink and there was also surrounding edema, so an excision was performed. Intraoperative findings showed a tumor originating from the dura mater, with the anterior portion showing a tumorous lesion of a different nature, and the border with the surrounding brain was unclear. Pathology showed components of meningioma and lung cancer, and it was determined that the lung cancer had metastasized to the meningioma. After surgery, the patient received 30 Gy of whole brain irradiation and was discharged home. CONCLUSION Although meningiomas are benign tumors, they have an extremely abundant blood flow, and the survival time for systemic cancer has been increasing, so it is important to keep in mind that there is a possibility of metastasis to meningioma, as in this case.