Abstract
IN the United States and Canada there are comparatively few cases of echinococcosis in man. Less than 2 per cent of these are found to involve the bones. Because of this rarity few roentgenologists ever see a case and hence do not suspect its presence when one occurs in their practice. As a correct pre-operative diagnosis is of great help in planning the operative procedure and as the roentgenogram can help in the diagnosis, it is important that roentgenologists be able to recognize the condition. The Taenia echinococcus is a small flatworm with two separate stages in its life cycle. As a sexually mature worm it lives in the small intestine of the dog. In man and some animals, such as sheep, cattle, and swine, it passes through the bladder-worm or cyst stage. The Taenia eggs are generally believed to enter man by way of the mouth. In the stomach the capsule is dissolved and the small embryo set free. The usual course from here is into the portal vein and thence to the liver. This accounts for the great prep...
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