VENOUS BLOOD TUMORS OF THE CRANIUM

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Abstract
The following propositions are submitted as the result of my study of this class of cranial venous tumors: 1. Cranial venous blood tumors communicating with the dural circulation are to be classified into three divisions, namely: the congenital, spontaneous, and traumatic. 2. These classes are divided, upon both anatomical and pathological grounds, into two species or varieties:a, the diffused, produced by a perforation of the cranial plates and the wall of the subjacent sinus, resulting in a limited extravasation of blood beneath the scalp and thus forming a blood-cyst in direct or immediate communication with the affected sinus; andb, the venous or vascular, in which the tumor is directly formed at the expense of the venous coats, and includes in its scope the sinuses, the venæ emissoria, and the diploic vessels. 3. The venous type is the commonest in point of occurrence, and of this type, varicose involvement

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