A Consideration of the Dermal Versus the Epidermal Cholesteatomas Having Their Attachment in the Cerebral Envelopes

In a series of approximately 750 verified brain tumors from the clinic of Dr. Harvey Cushing, there have occurred seven examples of true intracranial cholesteatomas.In 1920, Bailey 1 reported two of these, representing the nonhair-containing variety, and since the publication of this article there has been one further example of the same type.The other three tumors have contained hair, and therefore come under the heading of dermoids, or hair-containing cholesteatomas.It is with the latter three cases that this paper proposes to deal.