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The angiographic diagnostic features of concordant tumors of the posterior fossa in monozygotic twins are described. In both cotwins cranio-spinal subependymomas were found which had grown through the foramen magnum and reached from the fourth ventricle down to the second cervical vertebra. Thereby, the conformity of the clinical mainifestation, symptomotology and the course of the disease, the localisation and extent of the tumors as well as the neuroradiologic findings and the histologic features of the tumors were particularly striking. After a review and critical summary of the few cases of concordant affections with brain tumors in identical twins published in the literature at present our couple is discussed under the question of the possible influence of genetic factors or a hereditary disposition on the development of cerebral tumors.

The experimental basis and the results of a simple and easy catheter technique for the super-selective angiographic demonstration of small arteries in dogs are described. By Seldinger technique, a catheter is placed in the main artery near the origin of a branch. A selective catheter is then passed through it and placed in the arterial branch being demonstrated. With this "telescopic" technique, it was possible to achieve super-selective angiography of external branches with a lumen less than 2 mm. and also filling of the internal carotid artery and its branches without any complications, using seven dogs. The application of this technique for super-selective cerebral angiography in man is discussed.

Skull radiographs of the pharaoh Seqenenre-Ta'a II with special densitographic techniques have shown that he survived a perforating skull injury. The technique is described and its use in medical history and archaeology is discussed.