Robert P Yatto

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Hepatitis delta-virus (the delta-agent) is now recognized as a cause of acute hepatitis, fulminant hepatitis, chronic hepatitis, and cirrhosis in hepatitis B surface antigen-positive hosts. This report describes the clinical course and liver biopsy histopathology of acute delta-hepatitis in a young American woman with presumed chronic hepatitis B infection.(More)
Stone retention after duodenoscopic sphincterotomy may occur despite an adequate and well-performed sphincterotomy. We have identified factors contributing to stone retention in 26 patients. In 22 of these patients, the stones have been effectively managed with a biliary endoprosthesis in a manner which traps the stone proximally and maintains patency of(More)
Endoscopic therapy of early gastric cancer is applicable for differentiated-type mucosal carcinomas that have an extremely low potency of lymph-node metastasis. Among various kinds of endoscopic therapy, endoscopic mucosal resection is the most recommended procedure, because pathological evaluation of affected tissues is available using this method.(More)
Disorders secondary to strictures of various segments of the gastrointestinal tract, e.g. esophagus, stomach, bile ducts, pancreas and colon often produce symptoms requiring continuing medical management or aggressive intervention. Until now, surgery has been required for failures of medical treatment. Endoscopically placed balloon catheters offer an(More)
We determined the types of pancreatobiliary ductal anatomy in 58 chronic alcoholic patients with and without pancreatitis at ERCP. Twenty-four of 28 patients (86%) with pancreatitis had separately opening common bile ducts and pancreatic ducts, while only six of 30 patients (20%) without pancreatitis had this finding. We conclude that a separate channel(More)
Although variation is the rule with pancreatic duct morphology, certain anomalies occur as a result of altered embryological development. These anomalies can produce obvious clinical symptomatology or may be implicated as a cause of symptoms when noted in the evaluation of patients with gastrointestinal complaints of obscure origin. Gastroenterologists and(More)