ectopic 수막종: 2예

초록

Purpose. 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. Results. Case 1. Tumor excision was performed via frontal bone craniotomy and superior orbitotomy. The mass was seemed to be originated from the orbital roof, extended to orbital space and invaded to the dura mater. Also, the mass made the erosion of the frontal bone with hyperostosis. Histopathologic examination of the tumor was consistent with atypical meningioma Case 2. The mass was excised completely and confirmed the diagnosis of a cutaneous meningioma, transitional cell type. Conclusion. 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