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American Shared Hospital Services generates almost all of its profit from providing hospitals with the Gamma Knife, an instrument used to treat arteriovenous malfunctions (which involve the body's circulatory system) and certain brain tumors without making an incision. There are three types of PEH:(1) a pure (primary) form that arises de novo in dilated vessels; (2) a mixed (secondary or reactive) form that occurs focally in preexisting varices, hemangiomas, or arteriovenous malformations; and (3) a rare extravascular form that arises in hematomas. The prosthetic arteriovenous fistula could not be removed completely, although it was considered a potential reservoir of infection. |
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