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HighlightsEpidermoid cysts are benign tumors -IEIC-that originate in the spine or intracraneally.Intradural compose 75% of epidermoid cysts and 25% are extradural in the diploic space—IEIC.These benign lesions although they are of low incidence, are seen very rarely in intradiploic locations and above all, of significant size, may produce significant mass effect in patients, which was initially tolerated because of its slow growth, however, they may become decompensate and cause intracranial hypertension syndrome.

HighlightsWe did an asterional craniectomy, through a retrosigmoid approach, but, we observed absence of vascular compression in the entrance to the Trigeminal Nerve.Once performed the removal of the suprameatal tubercle, and Meckel’s segment of the Trigeminal nerve exploration was done, a vascular compression of the nerve by a branch of the superior cerebellar artery was found, just behind the trigeminal pore.When, the vascular compression is not evident at exploring the cerebellopontine angle, it is important to note that association of a prominent suprameatal tubercle may be able to hide a vascular compression of the nerve in this region.

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