Abstract
An extremely rare case of a sellar mature teratoma with a melanotic progonoma is reported. The patient was a 14-year-old boy who showed diabetes insipidus and panhypopituitarism. The tumor was composed of mature teratoma and clusters of pigmented and non-pigmented polyhedral cells which were identical to those seen in a melanotic progonoma in other sites. Premelanosomes were observed in the cytoplasm of the polyhedral cells under an electron microscope. Melanotic progonoma was considered to be of teratoid origin in the present case.
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