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[0] Epidermoid cyst [1] More common than dermoid cyst. [2] Similar to dermoid cyst. [3] Most of them are seen in the cerebellopontine angle and parapituitary area. Less than one-tenth of the cases occur in the spinal cord. Parapituitary tumors are usually embedded in the temporal bone. Similar to dermoid cyst, the pineal area is rarely involved. [4] They are found over a wide age range but most of them are discovered in the fourth to sixth decades. The clinical manifestations is due to local compression, irritation, and hydrocephalus. Leakage of the kertinous content will lead to extensive granulomatous meningitis. [6] The histology is similar to that of dermoid cyst except that no skin appendages are found. Rare cases of malignant transformation into invasive squamous cell carcinoma has been documented. [5] 
Well-defined round mass with a irregularly nodular capsule with a pearly discoloration.
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