We have observed four dermoid cysts, four lipomas, and one patient with a combination of both in this category of intramedullary tumors. Whereas hamar-tomas are not tumors in a strict sense - they do not contain proliferating cells - they are space occupying and displace spinal cord tissue. Quite regularly, they are not completely surrounded by cord substance and protrude out of the cord. The overwhelming majority of spinal hamartomas are located extramedullarly. We have only classified them as intramedullary if the major component of the lesion was embedded inside the spinal cord. Therefore, a more detailed discussion is provided in the section on extramedullary tumors. Among intramedullary hamartomas, one dermoid cyst and four lipomas were associated with a tethered-cord syndrome.

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