Biomedical subjects

Y Saida

Publications and source records attributed to Y Saida.

At least 37 records · Page 2Linked to original sources

PubMed1998

Ductectatic mucinous cystic neoplasms of the pancreas: evaluation with MR cholangiopancreatography.

OBJECTIVE: We performed this study to describe the advantages of MR cholangiopancreatography and its findings in revealing ductectatic mucinous cystic neoplasms of the pancreas. CONCLUSION: MR cholangiopancreatography using both projection and source images can reveal characteristic findings of a ductectatic mucinous cystic lesion of the pancreas and show the presence of the communicating duct between the cystic lesion and the main pancreatic duct.

Aged↗

PubMed1998

Transcatheter embolization of celiac artery pseudoaneurysm following pancreatico-duodenectomy for pancreatic cancer. A case report.

A case of transcatheter embolization of a celiac artery pseudoaneurysm in a 70-year-old man is reported. The pseudoaneurysm was considered to be the result of pancreatic anastomotic leakage and an intra-abdominal abscess following pancreaticoduodenectomy with irradiation of 66 Gy for pancreatic carcinoma. To avoid recanalization of the pseudoaneurysm due to retrograde blood flow, first all branches of the celiac artery were embolized with metallic coils, and then the celiac trunk was also occluded. Hepatic arterial flow was preserved by the right hepatic artery arising from the superior mesenteric artery. After the procedure, the patient had no noticeable complications associated with the embolization nor any recurrence of the pancreatic cancer, and he achieved a 2-year survival.

Aged↗

PubMed1997

A case of intravascular papillary endothelial hyperplasia (Masson's tumor) arising from renal sinus.

A 55-year-old woman had a right renal tumor incidentally diagnosed by ultrasonography. CT revealed a perirenal low density mass 3 cm in diameter. Dynamic CT showed peripheral enhancement of the tumor in early phase and internal homogeneous enhancement in delayed phase. Since hemangioma was considered most likely, we performed tumor resection and spared the right kidney. The tumor was supplied by the superior ureteral artery from the right main renal artery which was considered to be derived from the renal sinus. The tumor was diagnosed as intravascular papillary endothelial hyperplasia (Masson's tumor). This is the first report of intravascular papillary endothelial hyperplasia existing in the perirenal space. Although preoperative diagnosis of intravascular papillary endothelial hyperplasia is difficult, intra-operative pathology and kidney-sparing treatment should be considered in such a case.

Diagnosis, Differential↗

PubMed1997

Ultrasonographic visibility of supraclavicular lymph nodes in normal subjects.

We investigated the ultrasonographic assessment of the supraclavicular nodes in the neck of normal subjects. Supraclavicular areas were examined sonographically in 505 healthy persons using a 10 MHz transducer. The detection rate was 15.8%. In more than 90% of visible nodes, transverse diameters were less than 5 mm; no nodes were larger than 7 mm in transverse diameter. About half of nodes lacked the echogenic hilum and the mean longitudinal to transverse diameter ratio was 1.96. Although size was an important factor, presence of an echogenic hilum and the longitudinal to transverse diameter ratio were not considered adequate criteria for differentiating malignancy from benignity. Findings require careful assessment to avoid overinterpretation.

Adult↗

PubMed1997

Bronchoarterial inversion: radiographic-CT correlation in combined right middle and lower lobe collapse.

Pulmonary arteries of the right middle (RML) and right lower (RLL) lobes lie toward the lung periphery relative to their corresponding bronchi, i.e., along their lateral or posterior aspects. In contrast, those of the right upper lobe (RUL) tend to be located along the medial or anterior aspect of the bronchi. We postulate that a reversal of the normal bronchoarterial relationship at the lung base may indicate combined RML and RLL collapse. We evaluated bronchoarterial relation by computed tomography (CT) and posteroanterior (PA) chest radiographs n patients with combined RML and RLL collapse. On PA chest radiographs, an inverse bronchoarterial relationship could be recognized in the lower perihilar region in seven of 10 patients. In the 10 patients with complete collapse of both the RML and RLL, CT disclosed that the normal bronchoarterial relationship of the RUL was preserved, despite caudal extension of the RUL. In no case were arteries visible along the lateral aspect of bronchi. Thus, on frontal radiographs, when the bronchoarterial relationship in the right lower lung is inverse to that of normal subjects, combined collapse is strongly suggested.

Bronchography↗

PubMed1996

Stent endoprosthesis for obstructing colorectal cancers.

PURPOSE: Purpose of this study was to assess stent endoprosthesis for colorectal cancer (SECC) as an adjuvant to operative preparation in patients with obstructing colorectal cancers. METHODS: A self-expanding stainless steel stent was inserted in 15 patients with obstructing colorectal cancers under colonoscopic observation and fluoroscopic control. Following successful SECC, the colon was mechanically prepared using polyethylene glycol. Definitive surgical treatment then was undertaken. RESULTS: All 12 patients in whom the stent had been successfully placed recovered intestinal transit and tolerated mechanical preparation. A satisfactory preparation was confirmed during the operation. Two perforations and one dislocation were encountered. CONCLUSION: SECC is a new method for operative preparation of patients with obstructing colorectal cancers, which may reduce morbidity and mortality associated with this difficult problem.

Aged↗

PubMed1996

Hyperattenuating rim on noncontrast CT of the liver: probable peritumoral sparing of fatty infiltration.

CT scans showing a hyperattenuating rim within the liver were retrospectively evaluated in 10 patients to clarify the character, aetiology and clinical significance. All patients had hepatic tumours (7 cavernous haemangiomas in 6 patients, 3 metastatic tumours and 1 hepatocellular carcinoma) as well as fatty infiltration of the liver. Typical features of the hyperattenuating rim on noncontrast CT of the liver included (1) attenuation similar to that of the spleen, (2) a circular or semicircular shape, (3) a width of a few millimeters, (4) peritumoral localization and (5) loss of visualization with contrast enhancement. No such rims were noted around hepatic tumours unassociated with fatty infiltration. Peritumoral sparing of fatty infiltration was inferred. A hyperattenuating rim on noncontrast liver CT, although rare, suggests the presence of a hepatic tumour in fatty liver.

Adult↗

PubMed1996

Early squamous cell carcinoma of the lung: CT and pathologic correlation.

PURPOSE: To study the factors that influence computed tomographic (CT) visibility of early squamous cell carcinoma, which was defined as a lesion confined to the bronchial wall without lymph node metastasis. MATERIALS AND METHODS: CT was performed in 18 patients with 18 early squamous cell carcinoma lesions. The 5.0-mm or thinner sections were reviewed independently by three observers who were aware of the bronchoscopic findings, and the visibility of the lesions was correlated with histopathologic findings. RESULTS: Tumors consisted of 13 flat and five polypoid lesions. Three of the lesions were epithelial, eight were subepithelial, and seven were cartilaginous or extracartilaginous. Eleven lesions were visualized at CT as an endobronchial mass or focal bronchial wall thickening. Lesions with polypoid growth and/or cartilaginous or extracartilaginous invasion were all visualized, even on 5-mm-thick sections. Subepithelial lesions could be demonstrated when located at bronchi with craniocaudal orientation. CONCLUSION: CT is a valuable tool for diagnosis of early squamous cell carcinomas, particularly when lesions show polypoid growth and/or invade the cartilaginous layer.

Aged↗

PubMed1996

Hepatic hemorrhage in malignant rheumatoid arthritis.

Intrahepatic hemorrhage is a serious and life-threatening complication in liver disease. We describe a patient who had two episodes of intrahepatic hemorrhage after having malignant rheumatoid arthritis for 8 yr. Abdominal CT scans revealed a large intrahepatic, subcapsular hematoma. Arteriography demonstrated irregularity, caliber change, and pseudoaneurysms of the right hepatic artery, suggesting vasculitis as a cause of the bleeding. The hemorrhage was first treated with transcatheter arterial embolization, which failed to exert long term control, but arterial infusion of a large dose of prednisolone when the hemorrhage appeared was successful in managing it.

Adult↗

PubMed1995

Effect of temporary occlusion of the hepatic vein on dual blood in the liver: evaluation with spiral CT.

PURPOSE: To evaluate the contribution of hepatic veins to the dual blood supply in the liver under temporary hepatic venous occlusion. MATERIALS AND METHODS: Selected hepatic veins in 23 patients with liver tumors were temporarily occluded with a balloon catheter. Computed tomography (CT) arteriography, CT during arterial portography (CTAP), or both were performed with a spiral technique with and without temporary occlusion of a hepatic vein. RESULTS: After hepatic vein occlusion, a well-demarcated, wedge-shaped area of hypoattenuation was seen at CTAP and/or hyperattenuation was seen at CT arteriography in the following regions: left lobe (left hepatic vein), ventral part of the anterior segment and the medial segment except for the ventromedial part (middle hepatic vein), dorsal part of the anterior segment and the ventral part of the posterior segment (right hepatic vein), and dorsocaudal part of the right lobe (inferior right hepatic veins). CONCLUSION: After hepatic venous occlusion, the portal veins become draining veins and the occluded area is supplied with arterial blood alone.

Adult↗

PubMed1995

Hepatobiliary cysts in patients with autosomal dominant polycystic kidney disease: prevalence and CT findings.

OBJECTIVE: Hepatobiliary (intrahepatic and peribiliary) cysts have been described for patients with autosomal dominant polycystic disease. The purpose of this study was to determine the prevalence of these cysts and to describe the wide variation in their appearance on CT scans. MATERIALS AND METHODS: We studied CT scans for 64 patients (31 men and 33 women) who either had known autosomal dominant polycystic kidney disease or had renal cysts and a family member with polycystic kidney disease. Contrast enhancement was used for 31 patients. CT scans were retrospectively evaluated by consensus by two experienced radiologists. The presence, number, and size of hepatobiliary cysts and the presence and appearance of the two variations, peribiliary and intrahepatic cysts, were analyzed. Peribiliary cysts were determined to be present when many small (< or = 10-mm) cysts were seen adjacent to the larger (up to the third order) portal triad. Cysts present in the hepatic parenchyma but not in contact with the larger portal triad were regarded as intrahepatic cysts. RESULTS: CT showed hepatobiliary cysts in 56 of the 64 patients (24 men and 32 women; 88%). Intrahepatic cysts were noted in all 56 patients; peribiliary cysts were definitely seen on CT scans for 22 patients and were probably seen (fewer than five cysts and/or cysts located only on one side of the portal vein) on CT scans for 19 patients (73% of all patients with hepatobiliary cysts). Peribiliary cysts appeared as discrete cysts in 31 patients, as a string of cysts in six patients, and as a tubular structure in four patients. Intrahepatic cysts generally were round but occasionally were polygonal. They were variable in number, size, and location. CONCLUSION: Hepatobiliary cysts were noted in 56 of 64 patients (intrahepatic cysts in all cases and peribiliary cysts in 73% of positive cases). Intrahepatic cysts varied widely in number, size, and location, whereas peribiliary cysts were small and appeared as discrete cysts, a string of cysts, or a tubular structure adjacent to the larger portal triad. It is important to be aware of the wide variety of findings for hepatobiliary cysts so that they are not confused with other abnormalities.

Bile Duct Diseases↗

PubMed1995

Focal fatty masses of the pancreas.

Five patients with solitary fatty mass of the pancreas examined with CT and ultrasound (US) were evaluated. The areas of fat replacement were located in the pancreatic neck, body or tail. The size ranged from 4 to 30 mm in the longest diameter. The shape varied from roundish, to ovoid to semicircular, and the contour was universally well defined. The internal structure was homogeneous in 3 patients, but in one case there were thin septa and, in another, a slightly hyperdense part in the peripheral portion. All the masses except the smallest one were in part contact with pancreatic fat. CT showed fat with the same density as the peripancreatic fat and low HU units. The mass was hypoechoic in 2 cases and hyperechoic in one. The masses in the tail of the pancreas were not detected by US.

Adipose Tissue↗

PubMed1995

[Spatial and temporal alteration of the dual supply of the hepatic circulation with transient occlusion of the hepatic veins: spiral volumetric CT during arterial portography and arteriography].

To elucidate the contribution of hepatic veins to the blood flow of liver, CT arterial portography and/or arteriography was performed in eight patients having hepatocellular carcinoma with transient occlusion of the hepatic vein and eight without occlusion. In each patient with occlusion of the hepatic vein, CT showed a well-demarcated fan-shaped area of low density during arterial portography and increased density during arteriography in the corresponding area. Hepatic vein occlusion could result in the pooling of arterial blood in the liver parenchyma. Transient segmental hepatic venous occlusion might improve the results of transcatheter arterial infusion and transcatheter arterial embolization for liver tumors.

Adult↗

PubMed1994

[Distribution and frequency of gastric cancer at the para-cardiac region and fornix].

To clarify the distribution and frequency of gastric cancer in the upper third of the stomach, especially in the para-cardiac region and fornix, we reviewed 634 lesions of all gastric cancers in any location in the University Hospital of Tsukuba University from April 1985 to March 1992. The para-cardiac region was defined as a circular area of 6 cm in diameter around the cardia. We found 56 lesions (8.8%) in the para-cardiac region, almost all of which were concentrated in the distal half of the para-cardiac region, and only three of which (0.47%) were in the fornix. Cancer in the upper third of the stomach tended to occur predominantly in aged male patients, and histologically most of them were classified as having differentiated adenocarcinoma. Since the percentage of advanced cancer at the para-cardiac region was much higher than at any other location, we should be careful to obtain double-contrast images of sufficient quality during the upper gastrointestinal examinations and not to overlook subtle changes in this region during the interpretation of films.

Adenocarcinoma↗

PubMed1994

Hepatic peribiliary cysts: multiple tiny cysts within the larger portal tract, hepatic hilum, or both.

PURPOSE: To describe characteristic imaging features of hepatic peribiliary cysts. MATERIALS AND METHODS: Four patients with hepatic cysts in which the radiologic (n = 3) or histologic (n = 1) findings were consistent with peribiliary cysts of the liver (multiple small cysts seen exclusively in the larger portal tract, hepatic hilum, or both at gross examination and dilatations of extramural peribiliary gland at histologic examination) underwent computed tomography (CT) and ultrasound (US). In three patients, CT was performed after drip infusion of cholangiographic contrast material. RESULTS: Contrast material-enhanced CT clearly depicted many tiny cysts along the larger portal veins up to the third- or fourth-order branch (n = 3). US depicted multiple cysts in the echogenic portal tract definitely (n = 2) or equivocally (n = 2). On cholangiographic contrast-enhanced CT scans, cystic areas were located adjacent to or surrounding the bile ducts, and the possibility of biliary dilatation, communication, or both was disproved. CONCLUSION: Hepatic peribiliary cysts can be diagnosed with US and enhanced CT, especially with CT performed after administration of cholangiographic contrast material.

Aged↗

PubMed1993

[The evaluation of lung cancers hidden by the mediastinal and hilar shadows on the plain chest film].

We retrospectively evaluated the plain chest frontal radiographs in four cases in which the lung cancers were quite difficult to observe prospectively on plain chest frontal radiographs in spite of the relatively large size of tumors (over 3 cm in diameter). Three of four cases were central-type lung cancers, two squamous cell carcinomas and one adenosquamous cell carcinoma. Since there was no associated atelectasis or obstructive pneumonia in these cases, wall thickening and indistinctness of the lumen of the central bronchi were the significant findings for diagnosis. One case proven to be adenocarcinoma was located in the periphery of S6. A focally increased radiopacity behind the descending pulmonary artery was the only finding to pointed out. Since tumors were not demonstrated directly in the aerated lungs, the condition of the central bronchi as well as the degree radiopacity of the pulmonary artery should be carefully interpreted.

Adenocarcinoma↗

PubMed1993

Angiographic findings of Meckel's diverticulum: the characteristic appearance of the vitelline artery.

Angiographic findings of the vitelline artery in five patients with surgically proven Meckel's diverticulum were reviewed retrospectively. Superselective vitelline arteriography was performed in two patients and superior mesenteric arteriography in three. Arteriography showed the elongated artery without branching originating from the distal ileal artery and a group of tortuous vessels at the distal portion of this artery in all patients. A dense capillary staining of the vitelline artery was exclusively shown in patients with ectopic gastric mucosa. In one patient, injection of methylene blue intraoperatively through a previously placed angiographic catheter into the vitelline artery stained only the vitelline artery and Meckel's diverticulum in blue but neither the mesentery nor the ileum. Demonstration of a nonbranching artery from the ileal artery and a group of dilated tortuous vessels at the distal portion of this artery should suggest the possibility of Meckel's diverticulum and can be confirmed by selective injection of the artery. It should be emphasized that angiography can detect Meckel's diverticulum even in the absence of acute bleeding.

Adolescent↗

PubMed1993

Long-term survivors after salvage surgery combined with radiotherapy for recurrence of stage IV main hepatic duct cancer--report of two cases.

Main hepatic duct cancer is notorious for its poor prognosis and frequent locoregional failure of therapy even after curative resection. In this paper, two cases of recurrent carcinoma of the stage IVA main hepatic duct are presented. One patient had local failure 13 years after curative resection of the tumor and the other had regional failure 18 months after combination treatment with non-curative resection and intra-operative radiation therapy. Recurrent tumors were successfully treated with combined resection and postoperative radiation therapy or with combined intra-operative radiation therapy and postoperative radiation therapy. The patients are well 16.9 and 6.3 years, respectively, after primary tumor resection. We briefly review a number of other reports of salvage treatment in patients with recurrent carcinoma of the main hepatic ducts and discuss the results with particular reference to the advantage of salvage therapy for the main hepatic duct cancer.

Adenocarcinoma↗