During retrograde catheterization via the femoral artery and the brachial artery, the false lumen of a dissecting aneurysm was inadvertently entered in two patients. Bilateral carotid occlusion was produced in one by the high-pressure injection of contrast material into the false passage. A method is suggested to avoid this hazard.

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ing from the rectum. The mother states that her child (probably from 1 to 6 years old, rarely over 12) has suddenly passed a large amount of blood. An analysis of the amount of blood passed and its color is of prime importance. If the stool containing blood was passed in the toilet bowl the mother will have overemphasized the amount of blood passed; even a teaspoonful of blood in the bowl will make the water red enough to frighten the mother. The color of the blood is equally important. Usually, the first bowel movement in an otherwise normal child will be formed and will contain some brick-red blood. The second movement likewise will be brick-red.

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