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  • Title: [On the diploic epidermoid: report of two cases].
    Author: Abe S, Kojo T.
    Journal: No Shinkei Geka; 1993 Dec; 21(12):1113-7. PubMed ID: 8259222.
    Abstract:
    Primary epidermoid tumors comprise about 1% of all central nervous system neoplasms, although the diploic epidermoid tumor is comparatively rare. Two cases of diploic epidermoid tumor are reported in this paper. Case 1: A 70-year-old man presented with a headache. A plain craniogram showed an osteolytic lesion of the occipital bone with a well defined sclerotic margin. A contrast enhanced CT confirmed a cystic lesion with rim enhancement. On MRI, the tumor appeared hypointense surrounded with irregular hyperintensity on the T1WI and hyperintensity on the T2WI. Gd enhancement on the MRI showed no enhancement effect. The tumor was totally removed and cranioplasty was performed. No tumor invasion of the dura mater was noticed. Case 2: A 90-year-old woman presented with a giant tumor of the left parietal region. She noticed a painless swelling at the age of 20, and the tumor slowly grew over a period of 70 years. Plain craniogram showed a bony defect with a sclerotic margin. CT scan confirmed an extracranial giant tumor with destruction of the outer table under the tumor, and also falx meningioma. Aspiration and irrigation inside the cystic tumor were performed under local anesthesia. Previous authors have also said that the plain craniogram is characteristic and diagnostic in the case of diploic epidermoid. Typical round or polylobular bony defect with well defined sclerotic margins was visualized.
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