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The lead is again taken by the Cushing clinic in the discussion of a group of tumors of the nervous system which are composed either of fully formed blood vessels or of the cellular elements of the blood vessels. The former, discussion of which comprises one half of the book, are really not tumors in the strictest sense of the word. They are the angiomas which are capillary, venous or arterial, and are either considered as congenital lesions or have a vascular malformation as their basis. Explanation is made and examples are given as to how they exert pressure and therefore are to be considered in the same domain as tumors.
Of the entire group of tumors in the Cushing collection, consisting of 1,522 tumors of all kinds, only 29, or about 2 per cent, are in association with the blood vessels. Of these sixteen are in the first group