Epidermoid cysts are benign, uncommon lesions (1% of all intracranial tumors). Their localization is intradiploic in 25% of cases, and exceptionally subtentorial. We report here a rare case of giant intradiploic infratentorial epidermoid cyst. A 74-year old patient presented with recent diplopia and sindrome cerebellar. CT scan and MR imaging revealed a giant osteolytic extradural lesion of the posterior fossa (5,2 cm x 3,8 cm) with a small area of peripheral enhancement after contrast injection. Retrosigmoid suboccipital craniectomy allowed a satisfactory removal of the tumor, followed by an acrylic cranioplasty. The outcome was good. Neuropathological examination confirmed an epidermoid cyst. We review the literature and discuss our case.
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机译：表皮样囊肿是良性，罕见的病变（占所有颅内肿瘤的1％）。在25％的病例中，它们的定位是外交内部的，并且异常地是硬膜下腔的。我们在这里报告罕见的巨大的腹腔内下表皮样囊肿病例。一名74岁的患者最近出现了复视和小脑综合症。 CT扫描和MR成像显示后颅窝巨大的溶骨性硬膜外病变（5,2 cm x 3,8 cm），对比剂注射后周边区域面积较小。后乙状结肠枕下颅骨切除术可以令人满意地切除肿瘤，然后进行丙烯酸颅骨成形术。结果很好。神经病理学检查证实为表皮样囊肿。我们回顾文献并讨论我们的案例。
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