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Biomedical subjects

M Ohto

Publications and source records attributed to M Ohto.

At least 199 records · Page 11Linked to original sources
PubMed1983

Biliary cystadenocarcinoma diagnosed by liver biopsy performed under ultrasonographic guidance.

A case of a 60-yr-old man with biliary cystadenocarcinoma is reported. By needle biopsy of a cystic lesion performed under ultrasonographic guidance, overt malignant tissue could be obtained successfully. Histologic examination on autopsy material revealed that the tumor arose from preexisting benign liver cysts. The tumor showed a feature of well-differentiated, mucin-producing papillary adenocarcinoma in the primary site while, in the metastatic foci, it produced solid cell clusters with a tendency toward the differentiation into squamous cells.

Biopsy↗
PubMed1981

Collateral veins in portal hypertension: demonstration by sonography.

The diagnostic value of real-time sonography for portal hypertension was assessed in 38 patients with collateral veins using a linear array scanner in comparison with percutaneous transhepatic portography. The frequency of detection of collaterals by sonography relative to that by percutaneous transhepatic portography was 85% for the coronary, 100% for the paraumbilical, and 10% for the short gastric veins. Sonography demonstrated the paraumbilical vein in three patients in whom portography failed to opacify it. Real-time sonography is perhaps the first-choice procedure for the demonstration of collateral veins and diagnosis of portal hypertension.

Collateral Circulation↗
PubMed1980

The combined use of computed tomography and endoscopic retrograde cholangiopancreatography in the assessment of suspected pancreatic neoplasm: a blind clinical evaluation.

Sixty-one consecutive patients suspected of having pancreatic neoplasms had endoscopic retrograde cholangiopancreatography (ERCP) and computed tomography (CT). The ERCP results were 62% accurate, 8% false negative, and 3% failure. The overall accuracy in cases of successful pancreatic duct cannulation was 88%. The results of CT were 76% correct, 5% false positive, 13% false negative, and 6% indeterminate. Excluding ERCP failure, the CT-ERCP diagnosis was identical in 67%. When findings were identical, the accuracy rate was 93%, high than that of either study alone. The ERCP-CT examinations were often complementary and generally led to a more accurate and specific diagnosis.

Adult↗
PubMed1980

Ultrasonically guided percutaneous contrast medium injection and aspiration biopsy using a renal-time puncture transducer.

A real-time transducer for ultrasonically guided puncture was used for percutaneous contrast medium injection and aspiration biopsy in 160 patients with various diseases of the abdomen. Opacification of the bile ducts, pancreatic duct and the portal vein was accomplished in 157 patients. Percutaneous aspiration biopsy provided cytological proof of malignancy in 56 of 64 patients with suspected carcinoma. Ducts or vessels less than 10 mm wide on ultrasound images were successfully opacified, and biopsy confirmed at 2 X 2.5-cm carcinoma.

Biopsy, Needle↗
PubMed1980

Real-time sonography of the pancreatic duct: application to percutaneous pancreatic ductography.

Using a linear-array electronic real-time scanner, ultrasonic pancreatograms were obtained in 21 of 25 normal adults and in 28 of 29 patients with pancreatic disease. The normal pancreatic duct was seen as a thin anechoic tube with echogenic walls and an inner diameter under 0.8 mm. In patients with pancreatic disease, changes in the duct such as dilatation, obstruction, and pancreatic stones could be seen. When ultrasonic pancreatograms were compared with endoscopic pancreatograms in the same patients, there was a good correlation in the patterns of duct dilatation. Using a real-time transducer to guide a thin needle for puncture, both percutaneous pancreatic ductography and percutaneous aspiration biopsy of the pancreas were successfully performed as a single procedure in eight patients with carcinoma of the head of the pancreas. There were no major complications, and the examination provided a definitive diagnosis in all patients.

Adult↗