이소성수막종 ; 2례보고

초록

To report rare cases of ectopic meningioma of which the incidence is about 0.8%~0.9% on the English literatures, to review the literature on the subjects, and to recommend treatment. The patient, a 73-year-old woman, presented with a 10 month history of increasing proptosis and eyelid swelling of the right eye. Neuroradiologic findings were suggestive of an epidural meningioma. It seem to be extended to intra-orbital space with orbital bone erosion and there was hyperostosis with bone marrow invasion on right frontal bone. A 63-year-old man, who had past history of head trauma and skull fracture 20 years ago, presented with a 7 years history of a subcutaneous lesion overlying the mid-frontal region of the scalp, which was 6 x 7cm non-tender, fixed, bony hard mass adherent to the pericranium. A CT scan of the head demonstrated the subcutaneous lesion with hyperostosis of the skull and there was no intra-cranial connection. Casee 2. The mass was excised completely and confirmed the diagnosis of a cutaneous meningioma, transitional cell type.Ectopic meningiomas are rare tumors that develop from ectopic arachnoid tissue. The ectopic meningioma in Case 1 was suggested that it developed from an occasional arachnoid rest in supra-orbital wall (orbital roof). In Case 2, we suggest that this ectopic meningiomas origingated from meningeal tissue that had been trapped outside the central nervous system after the skull fracture 20 years ago. It was thought to be type 2 cutaneous meningioma of the classification by Lopez DA in 1974. Even though ectopic miningioma is locally invasive, the prognosis is good if the excision of the tumor is complete.