Chang Yun Hwang

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OBJECTIVES This study was conducted to evaluate the clinical role of integrated positron emission and computed tomography (PET-CT) in patients with suspected and potentially operable cholangiocarcinoma. METHODS Between October 2005 and May 2007, 123 patients with suspected cholangiocarcinoma were enrolled in this study after diagnostic workup, including(More)
BACKGROUND Although EUS-guided drainage procedures have been used to collect peripancreatic fluids, little is known regarding EUS-guided transmural gallbladder drainage for high-risk patients with acute cholecystitis. OBJECTIVE Our purpose was to evaluate the technical feasibility and outcomes of EUS-guided transmural cholecystostomy as rescue management(More)
BACKGROUND The utility of magnetic resonance cholangiography for assessment of longitudinal tumor extension of hilar cholangiocarcinoma was investigated with reference to findings by percutaneous transhepatic cholangioscopy. METHODS Ninety-nine patients with hilar cholangiocarcinoma underwent both magnetic resonance cholangiography and percutaneous(More)
Cystic lesions of the pancreas are being recognized with increasing frequency and have become a common finding in clinical practice. Cystic lesions of the pancreas display a wide spectrum of histopathology and biologic behavior. Differentiating among lesions and choosing an optimal therapy is challenging, and evidence-based guidelines for diagnosis,(More)
OBJECTIVES This study aimed to evaluate the adequacy of pancreatic core biopsy in histological diagnosis of autoimmune chronic pancreatitis (AIP). METHODS Histopathologic study as well as immunohistochemical staining using anti-IgG4 antibody was done with pancreatic tissue specimens of 26 AIP patients (19 transabdominal ultrasound (US)-guided core(More)
OBJECTIVES Serum immunoglobulin G (IgG) and/or IgG4 elevation is one of the notable characteristics of autoimmune chronic pancreatitis (AIP). The purpose of this study was to compare the sensitivity and specificity of IgG with those of IgG4 in the diagnosis of AIP. METHODS From December 2005 to March 2006, patients who were diagnosed as having ordinary(More)
BACKGROUND/AIMS Although endoscopic ultrasound guided fine needle aspiration (EUS-FNA) has been introduced and its use has been increasing in Korea, there have not been many reports about its performance. The aim of this study was to assess the utility of EUS-FNA without on-site cytopathologist in establishing the diagnosis of solid pancreatic and(More)
CONTEXT Chronic hepatitis B infection is the leading cause of cirrhosis and hepatocellular carcinoma. Human leukocyte antigen may be involved in the chronicity of hepatitis B virus (HBV) infection. OBJECTIVE To analyze the association between HBV chronicity and human leukocyte antigen alleles and haplotypes of 636 organ donors and recipients. DESIGN(More)
OBJECTIVES Tumor growth factor beta (TGF-beta) is an immunosuppressive cytokine and has been implicated in a variety of disease processes, including those in autoimmune disease. Tumor growth factor beta is also involved in fibrosis by regulating matrix metalloproteinases (MMPs) and the tissue inhibitor of MP (TIMP). The purpose of this study was to compare(More)
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