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A squamous cell carcinoma developed in the wall of an orbital cyst in a 53-year-old man. There was a vague history of previous injury, which was probably of no significance, and there was no evidence of any dermal elements in the cyst wall. The case appears to be unique because it most probably had its origin in a congenital epidermoid cyst.
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Wright et al. (1977) studied this question.
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