Efficacy of Magnifying Narrow Band Imaging with Acetic Acid Spray in Diagnosing Superficial Non-Ampullary Duodenal Epithelial Tumors.

BACKGROUND/AIMS: The aim of the present study was to evaluate the efficacy of magnifying narrow band imaging with acetic acid spray (MA-NBI) in differentiating category 4/5 lesions from category 3 lesions of superficial non-ampullary duodenal epithelial tumors (SNADETs) as per Vienna Classification and to compare the diagnostic performances of both MA-NBI and magnifying narrow band imaging (M-NBI). METHODS: We retrospectively identified 60 resected SNADETs (31 category 3 lesions and 29 category 4/5 lesions) in 60 patients who underwent M-NBI and MA-NBI preoperatively. We evaluated vascular and surface patterns using M-NBI and MA-NBI for characterizing category 3 and 4/5 lesions. The surface pattern was classified as tubular, villous, or mix structure using MA-NBI. In addition, lesions with disorganized and unclear structures with irregular margins that can be clearly recognized by MA-NBI were defined as irregular surface structures. RESULTS: For MA-NBI, category 4/5 lesions had a significantly higher mix structure rate and higher irregular surface structure rate than category 3 lesions (62 vs. 16%, p < 0.001, and 86 vs. 19%, p < 0.001, respectively). The diagnostic accuracy of MA-NBI using mix and irregular surface structures for identifying category 4/5 lesions was as follows: sensitivity, 62/86%; specificity, 84/77%; positive predictive value, 78/78%; negative predictive value, 70/86%; and accuracy, 73/82%. The diagnostic accuracy of MA-NBI using irregular surface structure was significantly higher than that of M-NBI (p < 0.05). CONCLUSION: MA-NBI may be useful in differentiating between category 3 and category 4/5 lesions of SNADETs.

[Prediction of pancreatitis following endoscopic retrograde cholangiopancreatography].

OBJECTIVE: The aim of this study was to determine if the difference in serum amylase levels prior to, and two hours following, an endoscopic retrograde cholangiopancreatography (ERCP), or the ratio of the two-hour post-ERCP amylase level to the pre-ERCP amylase level was a better predictor of post-ERCP pancreatitis (PEP). METHODS: This was a retrospective, single-center study of consecutive patients, who underwent ERCP between April 2015 and August 2018. Serum amylase was measured before and two hours following ERCP. We compared the difference and the ratio of the two levels in predicting PEP using a receiver operating characteristic (ROC) curve analysis. RESULTS: A total of 1029 patients underwent ERCP, with PEP occurring in 118 (11.5%). Multivariate analysis revealed that an elevated two-hour post-ERCP serum amylase level was a significant predictor of PEP. ROC analysis of the difference and the ratio of the two levels found good performance for both parameters, with an area under the curve (AUC) of 0.861 (95% confidence interval [CI], 0.823-0.900) and 0.847 (95% CI, 0.809-0.886), respectively. The difference between the values was a significantly more effective predictor of PEP, based on the AUC analysis (P = 0.011). CONCLUSION: The difference between pre and two-hour post-ERCP amylase levels is a better predictor of PEP than the ratio of the two.

[Vitamin K deficiency caused by nutritional malabsorption accompanying afferent loop obstruction:a case report].

This case involves a 73-year-old man who visited a clinic because he was experiencing dyspnea on exertion and acid reflux. He was diagnosed with anemia and referred for a medical check-up and treatment by his primary care physician. Iron deficiency anemia and prolonged prothrombin time were confirmed with a blood test and an abdominal enhanced CT revealed marked expansion of the afferent loop after a gastrectomy. The medical check-up revealed abnormal blood coagulation due to afferent loop obstruction, which resulted in vitamin K deficiency. He was supplemented with vitamin K, and surgery was performed for the afferent loop obstruction. Postoperatively, his anemia, nutritional status, serum vitamin K levels, and prothrombin time improved steadily. In conclusion, nutrient malabsorption may occur in cases of afferent loop obstruction and abnormal blood coagulation due to vitamin K deficiency.

A case of resected hepatocellular carcinoma after drug-eluting bead transarterial chemoembolization.

We report a case of resected hepatocellular carcinomas (HCCs) after drug-eluting bead transarterial chemoembolization (DEB-TACE). A 67-year-old man with alcoholic liver disease was diagnosed with HCCs. Serological markers for hepatitis B and C viruses were negative. Among tumor markers, alpha-fetoprotein was 2.7ng/mL, and protein induced by vitamin K absence II was 868mAU/mL. Two HCCs were detected using dynamic computed tomography: one was 9cm in diameter in S8 and the other was 2cm in diameter in S4. We performed DEB-TACE using HepaSphere(®) and epirubicin. DEB-TACE was repeated three times in three months. Severe postembolization syndrome was not seen with any treatment. Four weeks after the last DEB-TACE, we performed surgical resection. Histopathological study revealed dense distribution of numerous bead particles in necrotic tumor tissue. Otherwise, in non-cancerous tissue, some beads were in portal areas, without necrotic change. Granulomas from foreign body reaction with giant cells were present around the beads. There were no necrotic changes in the smaller HCC, the intrahepatic metastatic nodules, or the microscopic invasion to the portal vein. In conclusion, DEB-TACE would be a useful treatment for huge HCCs; however, patients should be monitored for early recurrence from residual tumor tissue. This study will be helpful to perform DEB-TACE in the future.

Contrast-enhanced ultrasonography evaluation of hepatocellular carcinoma with peritumoral fat-spared area: a case report.

Peritumoral fat-spared area (PTFSA), a focal spared area surrounding hepatic tumors, is a specific finding of liver tumors in fatty livers. PTFSA mimics a liver tumor, making it difficult to recognize the tumor boundary. We report a case of a 56-year-old man with fatty liver who was diagnosed with a liver tumor. Ultrasonography (US) revealed a nearly homogeneous hyperechoic liver tumor measuring 40 mm in the left lobe. A thick hypoechoic area was observed around the tumor that spread more widely than an ordinary halo. Histological examination revealed that the hypoechoic area comprised a thin fibrous capsule and normal liver parenchyma without fat, which is PTFSA. Contrast-enhanced US (CEUS) indicated corona enhancement only at the inner part of the PTFSA. The inner part showed the same pattern as that of an ordinary halo and was a part of hepatocellular carcinoma, whereas the outer part showed the same pattern as that of the other liver parenchyma. CEUS was an effective modality for distinguishing the difference. Thus, CEUS was useful in defining the tumor boundary. Before initiating treatment, tumors should be evaluated using various modalities to detect their accurate boundary. CEUS may be a useful modality for detecting the boundary and making a diagnosis.