Intracranial cysts of the dermoid type are seldom recognized clinically. It is doubtful whether any case of dermoid cyst of the brain has been diagnosed before operation. Occasionally one has been revealed at the operating table, but most of the cases have been reported from necropsy material. The presence of a crescentic shadow in roentgenograms, caused by a calcified area in the wall of the cyst, has been observed in two or three instances. The finding of similar shadows in cases of suspected brain tumor, while not pathognomonic, should at least suggest the possibility of a dermoid cyst. The whole subject of intracranial dermoid and epidermoid cysts, cholesteatomas and teratomas has become considerably confused in nomenclature, as the nature of the lesion depends not only on the cell layers from which these growths arise—be they epithelial or endothelial in origin—but also on the location and the nature of the contents
RAND CW. INTRACRANIAL DERMOID CYSTS: REPORT OF A CASE, WITH OPERATIVE FINDINGS. Arch NeurPsych. 1925;14(3):346–357. doi:10.1001/archneurpsyc.1925.02200150059005
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