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Biomedical subjects

M Ohto

Publications and source records attributed to M Ohto.

At least 181 records · Page 10Linked to original sources
PubMed1986

[Intracavitary high dose rate afterloading irradiation of inoperable malignant bile duct obstruction].

After decompression of the bile duct with PTCD, seven patients with carcinomas of the bile ducts were submitted to an intracavitary Ir-afterloading irradiation performed according to the high-dose-rate method with a Buchler device. Most of the patients were irradiated with 30 Gy in two fractions. Five patients were also exposed to percutaneous radiation with 40 to 50 Gy. Local control was achieved in six patients. One patient developed a locoregional recurrence which was possibly due to a so-called "geographic miss". In one patient a benign fibrotic stenosis of the bile duct was found at the site of most intensive irradiation. Intracavitary irradiation is very important in the treatment of malignant obstruction of bile ducts. However, there is an urgent need of research with regard to the combined method with percutaneous irradiation and to the optimum fractionation of intracavitary high dose rate irradiation.

Aged↗
PubMed1985

Association of gallbladder carcinoma and anomalous pancreaticobiliary ductal union.

A total of 96 patients with gallbladder carcinoma in whom direct cholangiography clearly opacified the pancreaticobiliary ductal union and the common channel, and 65 patients with an anomalous union of these two duct systems at a distance greater than 15 mm from the papilla of Vater (normally less than 4.6 +/- 2.2 mm, mean +/- SD) were studied. It was found that this anomalous ductal union occurred in 16.7% of the patients with gallbladder carcinoma in comparison with an incidence of 2.8% among 641 consecutive patients with various hepatobiliary and pancreatic diseases studied by endoscopic retrograde cholangiopancreatography who did not have gallbladder carcinoma. It was also found that gallbladder carcinoma occurred in 24.6% of the 65 cases of anomalous ductal union in comparison with a 1.9% incidence of this cancer among 635 consecutive patients similarly studied and found to have normal ductal union (p less than 0.001). Thus, a close etiologic association was suggested between this anomaly in the terminal segment of the biliary tract and gallbladder carcinoma. Of the 65 patients with anomalous ductal union, 50 had the so-called congenital cystic dilatation of the common bile duct and 15 did not. Five of the 50 (10%) and 11 of the 15 (73.3%) had gallbladder carcinoma (p less than 0.01), and this carcinoma seems to be related to anomalous ductal union rather than to cystic dilatation of the common bile duct. As a tumorigenic factor in this anomaly, regurgitation of pancreatic juice has been stressed.

Adult↗
PubMed1984

Bacteriological study of transhepatically aspirated bile. Relation to cholangiographic findings in 295 patients.

The purpose of this study was to elucidate the frequency of bacterial infection of intrahepatic bile in relation to biliary tract pathology. Bile was aspirated during percutaneous transhepatic cholangiography, with or without combined biliary tract drainage, and subjected to bacteriological investigations in 295 patients with various hepatobiliary diseases. Bile was infected in 89% of the 92 patients who had high fever and were on antibiotics at the time of study. Positive cultures were obtained in 39% of the patients who were not so ill as to require antibiotics. The overall incidence of biliary infection was 90% in bile duct stones, particularly high in patients with primary intrahepatic stones, regardless of the presence of stones in the common bile duct, and in patients who had dilation of the common bile duct, presumably due to obstructive involvement of the ampulla of Vater. E. coli and Klebsiella were the most frequent among the aerobic species isolated, and mixed infection involving these organisms was common. Anaerobes were much less frequent, always mixed with aerobes, but positive cultures would increase with more rigorous anaerobic conditions for culture. Duodenal fluid collected simultaneously did not always grow the same microorganisms, but showed a 86-87% coincidence with intrahepatic bile in terms of positive or negative cultures. It is recommended that bile be cultured at the time of percutaneous transhepatic cholangiography.

Ampulla of Vater↗
PubMed1984

Diagnosis and clinical features of small hepatocellular carcinoma with emphasis on the utility of real-time ultrasonography. A study in 51 patients.

The clinical features and usefulness of various methods for diagnosis of small hepatocellular carcinoma, no greater than 5 cm in diameter, were studied in 51 patients. The diagnosis was verified in 28 patients by hepatic resection and in 4 patients at autopsy. The tumor was less than 3 cm in diameter in 23 patients. In 37 patients (72.5%), the tumor was first discovered by real-time linear scan ultrasonography, generally during a routine periodic follow-up examination of patients with chronic liver disease, mostly cirrhosis. Clinically, 62.7% of the patients were asymptomatic, and symptoms in the remainder were not suggestive of carcinoma. Most patients showed only mildly abnormal liver function tests that did not suggest the diagnosis. Serum alpha-fetoprotein level was normal in 25.5%, and it was elevated above 200 ng/ml in only 33.3%. Among the various imaging modalities, ultrasonography had the highest detection rate (92.2%) for these small hepatocellular carcinomas compared with computed tomography (73.2%), scintigraphy (50.0%), and angiography (86.0%). False-positive lesions, however, were also found frequently by ultrasonography, requiring ultrasonography-guided biopsy for differential diagnosis in some of the patients. Routine examination at regular intervals of patients with chronic liver disease using a combination of real-time ultrasonography and alpha-fetoprotein measurement is currently the most effective approach to detecting small hepatocellular carcinoma.

Adult↗
PubMed1984

Cholangiographic features in hepatolithiasis.

The cholangiographic features of hepatolithiasis in 150 patients studied by PTC and ERC are described. On the basis of the findings, it is suggested that hepatolithiasis be divided into primary and the secondary groups, and the former into the major intrahepatic bile duct type and the peripheral intrahepatic bile duct type. There is certain correlation between these cholangiographic classifications and clinical features.

Adult↗