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Biomedical subjects

S Furui

Publications and source records attributed to S Furui.

At least 109 records · Page 6Linked to original sources
PubMed1981

Differential diagnosis of hepatic masses on computed tomography, with particular reference to hepatocellular carcinoma.

Differential diagnosis was attempted in 225 cases of hepatic masses using computed tomographic (CT) criteria. Hepatocellular carcinomas were suggested by the presence of an isodense mass, a narrow circular zone surrounding the mass, bulging of the tumor from the hepatic surface, decreased attenuation of an entire hepatic lobe, and diffuse homogeneous enhancement following bolus injection. The presence of liver cirrhosis on CT also favored the diagnosis of hepatocellular carcinoma. More than half the metastatic tumors showed findings rarely encountered in hepatocellular carcinomas, i.e., more than 10 lesions, masses with nodular margins and showing a gradual decrease in density toward the center, multiple calcifications, and peripheral enhancement following bolus injection. All cavernous hemangiomas were correctly diagnosed by serial scanning after bolus injections. Hepatic abscesses also revealed pathognomonic CT findings, while cholangiocarcinoma did not disclose characteristic features. Rapid serial scanning after the bolus injection of contrast medium was very helpful in the differential diagnosis of hepatic masses by CT.

Adenoma, Bile Duct↗
PubMed1980

Computed tomography and ultrasound in the diagnosis of intrahepatic calculi.

Computed tomography (CT) and ultrasound were used to evaluate intrahepatic biliary calculi in 16 patients. Thirteen demonstrated high-density shadows in dilated intrahepatic ducts on CT. Of the 11 who also underwent ultrasonography, 7 had positive findings. Strong echoes with acoustic shadows in dilated intrahepatic biliary ducts are diagnostic of stones. CT and ultrasound are useful in evaluating intrahepatic calculi, with CT being particularly helpful in postoperative cases.

Adult↗
PubMed1980

Computed tomography of cavernous hemangioma of the liver.

Twelve cases of hepatic hemangioma were examined by computed tomography (CT). Dense accumulations of rapidly injected contrast material in or near the periphery of the lesions were demonstrated in early postcontrast scans. They invaded the area of low density and diminished in attenuation value with time. This marked decrease of the low density area noticed in the precontrast scan was also seen in the later postcontrast scan. These findings were recognized in all 10 cases of hemangioma examined with contrast enhancement, while no cases of hepatoma showed such a peripheral high density zone. Most hepatic hemangiomas could be correctly diagnosed by CT alone.

Adult↗
PubMed1980

Computed tomography of gallbladder carcinoma.

Twenty-seven gallbladder carcinomas were examined by computed tomography (CT). All patients had abnormal CT findings, suggesting a gallbladder lesion in 26. Based on the major CT findings, gallbladder cancer was classified as "massive," "thickened wall," or "intraluminal." Twenty cases were diagnosed correctly as cancer: on retrospect, definite findings of gallbladder cancer were observed in 24 and equivocal or misleading signs in 3. Some cases of chronic cholecystitis and liver tumor were difficult to differentiate from gallbladder cancer. Direct hepatic extension was easily seen, but lymph-node metastases and bile-duct extension were difficult to distinguish.

Adenocarcinoma↗
PubMed1980

Dynamic CT densitometry of hepatic tumors.

Forty-two patients with hepatic tumors were examined by serial computed tomography (CT), using bolus injection of contrast medium. Scanning was at 15, 60, and 120 sec postinjection at a slice level containing the tumor. The densities of the tumor, liver, and aorta were sampled on these and on precontrast CT images. The tumors were divided into four types according to the pattern derived by sequential plotting of the density difference between the tumor and the liver parenchyma. Type I manifested rapid and prolonged high tumor enhancement, in type II the tumor was enhanced rapidly but then quickly became less dense than the liver, in type III there was no significant change over time in the density difference between the tumor and the liver, and type IV showed no, or very little, tumor enhancement. All cavernous hemangiomas belonged to type I while two-thirds of the hepatomas wer type II. There was a good correlation between tumor vascularity on CT and angiography. We suggest that dynamic serial CT scanning technique may be an improvement over the conventional drip-infusion technique in assessing liver tumors.

Absorptiometry, Photon↗
PubMedDate not supplied

Cystic islet cell tumors: radiologic findings in three cases.

We report three cases of cystic islet cell tumors, two caused by gastrinomas and the other by an islet cell carcinoma. All three patients underwent computed tomography (CT) and angiography and two also had magnetic resonance (MR) imaging. Several common radiographic findings were present as follows: thickening of the cyst wall and irregularity of the inner surface on postcontrast CT and MR images, neovascularity and a densely staining hypervascular rim on angiography, and moderately increased signal intensity of the cyst content on T1-weighted MR images, which indicated fluid containing blood and/or necrotic tissue. These findings are helpful in defining the nature of these lesions and strongly suggest that cystic islet cell tumor should be included in the differential diagnosis.

Angiography↗
PubMedDate not supplied

Isolated dissection of the superior mesenteric artery: CT findings in six cases.

Dissection of the superior mesenteric artery (SMA) not associated with aortic dissection is rare. The purpose of this study is to describe the computed tomographic (CT) findings of this condition. We studied the CT findings of six patients with isolated dissection of the SMA. CT demonstrated thrombosis of the false lumen or intramural hematoma (n = 4) and/or intimal flap (n = 4) in all six patients. Other CT findings were enlarged diameter of the SMA (n = 5), increased attenuation of the fat around the SMA (n = 5), and hematoma in the mesentery with hemorrhagic ascites (n = 1). CT is useful for the diagnosis of isolated dissection of the SMA, and increased attenuation of the fat around the artery is considered the key to the diagnosis when no definite findings are evident.

Aged↗
PubMedDate not supplied

Retroperitoneal malignant mesenchymoma: imaging findings in five cases.

BACKGROUND: To describe computed tomographic (CT), magnetic resonance (MR), ultrasonographic (US), and angiographic findings of retroperitoneal malignant mesenchymoma with emphasis on CT findings. METHODS: Five CT, four US, four angiography, and two MR studies were obtained in five patients with pathologically proven retroperitoneal malignant mesenchymoma. RESULTS: Tumors were larger than 10 cm (n = 4), well-circumscribed and heterogeneous (n = 4), and with massive intratumorous calcifications (n = 3) on plain CT or US. Tumors showed heterogeneous enhancement on contrast-enhanced CT scans (n = 4) and moderate hypervascularity with heterogeneous staining on angiography (n = 3). Tumors were essentially hypointense on T1-weighted MR images (n = 2) and heterogeneous hyperintense on T2-weighted MR images (n = 2). Plain CT showed a fat-dense structure in a tumor in one patient. CONCLUSIONS: The radiologic findings of large expansile heterogeneous masses in the retroperitoneum, especially with massive calcifications, were considered to be typical of malignant mesenchymomas.

Aged↗
PubMedDate not supplied

Emergent right coronary artery thrombectomy with a jet aspiration thrombectomy catheter.

A saline-jet aspiration thrombectomy (JAT) catheter was used in a patient with acute myocardial infarction. A right coronary arteriogram showed complete thrombotic occlusion at the proximal segment. With this catheter the thrombus was removed without complications in 5 sec. The patient underwent percutaneous transluminal coronary angioplasty and placement of a Palmaz-Schatz stent after successful thrombectomy. Thrombectomy with a JAT catheter was very useful in this patient.

Aged↗
PubMedDate not supplied

Clinical application of an ultra-thin pancreatoscope using a sequential video converter.

The main pancreatic duct was studied endoscopically by inserting an ultra-thin pancreatoscope into the normal papilla of Vater. Recently, we developed a new pancreatoscope system and improved the image, the durability, and the ease of use. A special video converter was connected to the head of the pancreatoscope. The sequential electronic endoscope images were observed on a TV monitor. We performed examinations with this new system in 52 cases (8 with pancreatic cancer, 19 with chronic pancreatitis and 25 normal cases). We studied the brightness, color and quality of the images on 35-mm film and on videotape. As a result, it has become clear that the images obtained with this system are much better than those obtained by the conventional method. Although further improvement in the ability to angulate the endoscope is necessary, this new pancreatoscope system should help diagnose diseases of the pancreas.

Chronic Disease↗
PubMedDate not supplied

MR imaging of portal vein thrombus in hepatocellular carcinoma.

This report describes the magnetic resonance (MR) demonstration of portal vein tumor thrombus (PVTT) in hepatocellular carcinoma (HCC). In two cases of HCC with PVTT diagnosed by angiography, MR demonstrated PVTT as areas of increased MR signal in the portal vein. Our limited experience suggests the potential utility of MR imaging for diagnosis of PVTT.

Carcinoma, Hepatocellular↗