Extensive pulmonary metastasis of an intracranial meningioma with repeated recurrence: radiographic and pathologic features.

Recurrent intracranial meningioma with multiple pulmonary metastases is rare. In this case, the initial tumor had been diagnosed and removed 10 years earlier, and subsequent locally recurrent tumors were removed three times. Nine pulmonary metastases were discovered and resected recently. The metastatic lesion was confirmed as meningioma or arachnoidocytoma by light and electron microscopy and immunohistochemical studies. The patient survived all the operations.