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T Namieno

Publications and source records attributed to T Namieno.

At least 37 records · Page 2Linked to original sources
PubMed1997

Diagnostic features on images in primary small cell carcinoma of the pancreas.

Small cell carcinoma of the pancreas is a rare tumor with very poor prognosis, but the tumor is successfully treated by chemotherapy. Therefore, small cell carcinoma must be differentiated from other pancreatic tumors on images. A 71-year-old man presented with digestive symptoms. Multiple hypoechoic masses were detected on transabdominal ultrasonography and lateral shadow and posterior echo enhancement on endoscopic ultrasonography. The dynamic computed tomography scan revealed that the tumor walls were hypervascular at an early phase, and that the central portions were gradually stained at a late phase with differences among the tumors; tumor stains were also found on angiography. The distal site of the main pancreatic duct was completely interrupted, as seen on endoscopic retrograde pancreatography. The resected specimens were composed of circumferential hard walls and internally necrotic, hemorrhagic contents of different degrees and were microscopically diagnosed as small cell carcinoma. The tumor has to be differentiated from hypervascular pancreatic tumors, especially islet cell tumors.

Aged↗
PubMed1996

A long-surviving patient with recurrences of hepatic alveolar echinococcosis after traumatic intra-abdominal rupture.

Alveolar echinococcosis of the liver (AEL) takes a progressive and malignant course. Intra-abdominal dissemination of the parasite has a miserable outcome. Complete resection of the lesion is indispensable for the curative treatment of AEL. We experienced an extremely rare case of intra-abdominal rupture of AEL. The patient had repeated recurrences of AEL following the traumatic rupture of the lesion. After repeated resections of the lesions and appropriate medication, the patient is still alive more than 25 years since the initial onset of the disease. AEL differs from unilocular echinococcosis in terms of biological behavior. We compare the pathophysiology of the two conditions.

Adult↗
PubMed1996

General pattern of lymph node metastasis in early gastric carcinoma.

A reliable method for recognizing lymph node metastasis is indispensable for the attending physician to recommend less extensive treatment for early gastric carcinoma. Here we review 1137 consecutive patients with a single primary lesion, and the incidence and distribution of nodal involvement were investigated for correlations with pathologic findings. The overall incidence of metastasis was 9.5%: 2.6% for mucosal and 16.5% for submucosal carcinomas, a significant difference. The occurrence of metastasis was highest for lesions of the macroscopically mixed type, microscopically diffuse type, and large size. The involved nodes were most frequently found in the perigastric nodes along the lesser and greater curvatures, and it was well correlated with the tumor location, macroscopically depressed/mixed type, cancer depth, and histology. The diffuse-type carcinomas were most likely to metastasize to distant nodes. The distribution of involved nodes for early gastric carcinoma was similar to that for advanced carcinoma, as previously been reported. The submucosal carcinomas in this series had no indications for less extensive treatment, such as endoscopic or laparoscopic limited surgery. These carcinomas should be subject to standard surgery with gastrectomy and combined dissection of lymph nodes, especially node stations 1 and 3 to 8. The mucosal carcinomas sometimes involved the perigastric nodes, and such cases underwent gastrectomy and lymphadenectomy of node stations 1 and 3 to 7. Mucosal carcinomas 10 mm or less in size were negative for lymph node metastasis and were considered appropriate for less extensive treatment.

Carcinoma↗
PubMed1996

Balloon-occluded retrograde transvenous obliteration for gastric varices with gastrorenal or gastrocaval collaterals.

OBJECTIVE: The purpose of this study was to evaluate the efficacy of balloon-occluded retrograde transvenous obliteration for gastric varices with gastrorenal or gastrocaval collaterals. SUBJECTS AND METHODS: Thirty patients who had gastric varices with gastrorenal or gastrocaval collaterals underwent balloon-occluded retrograde transvenous obliteration. A 5-French balloon catheter was inserted in the gastrorenal collateral, gastrocaval collateral, or both, and a 5% solution of ethanolamine oleate iopamidole that contained equal amounts of ethanolamine oleate and iopamidole 300 was injected into the gastric varices. One day, 1 week, and 1 month after balloon-occluded retrograde transvenous obliteration, hepatic and renal function tests (total bilirubin, transaminase, blood ammonia, serum creatinine, and blood urea nitrogen) were done. To evaluate therapeutic efficacy, we observed the site with endoscopy every 2 weeks and obtained enhanced CT scans every month. The observation time ranged from 10 to 30 months. RESULTS: After balloon-occluded retrograde transvenous obliteration, gastric varices disappeared completely in all 30 cases in 4-16 weeks (mean, 10 weeks). Recurrence of gastric varices was observed in three cases (10%), which were treated with repeated balloon-occluded retrograde transvenous obliteration. Esophageal varices were aggravated in three patients (10%), who underwent successful endoscopic injection sclerotherapy. Complications of balloon-occluded retrograde transvenous obliteration were fever and hemoglobinuria, which disappeared in about 5 days. We observed no significant hepatic and renal functional damage. CONCLUSION: Balloon-occluded retrograde transvenous obliteration offers good control of gastric varices with gastrorenal or gastrocaval collaterals, even if hepatic function is poor.

Ammonia↗
PubMed1996

Percutaneous transhepatic biliary drainage using color Doppler ultrasonography.

We performed percutaneous transhepatic biliary drainage using color Doppler ultrasonography to decrease the complications of percutaneous transhepatic biliary drainage. Thirty patients underwent this procedure. We performed this method after identifying the second and third branches of the intrahepatic bile ducts, including the portal and the hepatic veins. The success rate of percutaneous transhepatic biliary drainage using color Doppler ultrasonography was 100% with one puncture in 29 patients and with two punctures in only one patient. We never encountered severe complications, such as bleeding, infection, hemobilia, or pseudoaneurysm formation in the hepatic artery. This method was safer and easier than the usual method using B-mode ultrasonography only.

Aged↗
PubMed1996

Primary malignant melanoma of the esophagus: diagnostic value of endoscopic ultrasonography.

Primary malignant melanomas of the esophagus have been clinically diagnosed as exophytic tumors by esophagography and esophagoscopy. We first applied endoscopic ultrasonography to the tumors; the tumors were demonstrated as "submucosal tumors" and smooth-surfaced with clear margins, and their internal echo-architectures depended upon the tumor sizes. We consider the disease can be clinically diagnosed by the above three diagnostic modalities.

Aged↗
PubMed1995

Adjuvant chemoimmunotherapy for hepatocellular carcinoma patients. Adriamycin, interleukin-2, and lymphokine-activated killer cells versus adriamycin alone.

To determine improved postresection survival in patients with hepatocellular carcinoma, two postoperative protocols were compared: adoptive chemoimmunotherapy versus chemotherapy. Following resection, 24 patients were allocated at random to receive (1) arterial infusion of Adriamycin, recombinant interleukin-2 and lymphokine-activated killer cells or (2) arterial infusion of Adriamycin alone. The spleen was removed at operation and used to prepare lymphokine-activated killer cells. Each group had 12 patients. They were followed until signs of recurrence appeared. The overall survival rates of the patients were 91.7%, 82.9%, and 72.5% at 1, 2, and 3 years, respectively, and slightly higher than would be expected with surgery alone. No statistically significant difference was found between the two groups either in the survival rate (generalized Wilcoxon test, P = .936) or in the cumulative disease free rate (P = .182). However, when patients who had had hepatic resection with negative margin (> or = 1 cm) were separated, the 2-year cumulative disease-free rate in the adoptive chemoimmunotherapy was higher (83.3%, n = 6) than that in chemotherapy (37.5%, n = 8). Toxicity to adoptive chemoimmunotherapy was moderate; no severe side effects were observed. Totally no statistical difference between the two groups was found. Although only one of six patients in adoptive chemoimmunotherapy experienced recurrence after hepatic resection with negative margin, it was not feasible to determine the role of interleukin-2 and lymphokine-activated killer cells. We conclude that the adoptive chemoimmunotherapy in this study is not an ideal adjuvant protocol after hepatic resection.

Aged↗
PubMed1995

Age-related, different clinicopathologic features of hepatocellular carcinoma patients.

OBJECTIVE: The authors attempted to clarify the clinicopathologic differences of hepatocellular carcinoma (HCC) patients, according to age distribution, and to investigate whether these differences contribute a certain hepatocarcinogenesis. SUMMARY BACKGROUND DATA: Hepatitis-associated viruses causing HCC have been investigated, and the infection of the viruses and etiologically, the peak age of the disease vary according to geographic barriers. However, a correlation between clinicopathologic differences and the age distribution of the patients is not well understood. METHODS: The authors reviewed their institutional experience from 1978 to 1990 in treating 428 patients with HCC. The carrier rate for hepatitis B surface antigen (HBsAg), the frequency of occurrence of high serum alpha-fetoprotein (AFP) of 2000 ng/mL, the degree of liver damage represented by the retention rate of indocyanine green dye at 15 minutes (ICGR15), and the incidence of accompanying liver cirrhosis were investigated and compared in each decade of age. RESULTS: The HBsAg carrier rate and the frequency of high serum AFP values were significantly prominent in the younger patients (20-49 yrs). The degree of liver damage and the incidence of liver cirrhosis were prominent in the elderly patients (older than 70 yrs) or the middle-aged patients (50-69 yrs); however, these four values in the middle-aged patients were intermediate with respect to those observed in the other two age groups. In addition, there was a positive correlation between the HBsAg carrier rate and the frequency of high serum AFP values or between the degree of liver damage represented by ICGR15 and the incidence of liver cirrhosis, showing that the former correlation was inversely related to the latter. CONCLUSIONS: The authors' study indicates that there are age-related differences of clinicopathologic features in HCC patients, suggesting that there are different steps or mechanisms of hepatocarcinogenesis according to the patient's age-distribution.

Adolescent↗
PubMed1995

[Two hepatocellular carcinoma patients with biloma after transarterial embolization with lipiodol (Lip-TAE) leading to occlusion of portal vein].

We presented two patients with post-Lip-TAE biloma resulting in portal occlusion, and reviewed 20 previous studies including our cases to investigate their clinical characteristics. Case 1. A 31-year-old woman suffered from an HCC located at the S8 segment, and had a superselective embolization of feeding arteries using 3 ml of Lip, 300 mg of CBDCA, and 40 mg of Epi-Adriamycin (Epi-ADM). Eleven weeks later, CT showed multiple cystic lesions, and the percutaneous transhepatic drainages of the lesions were established. At 21 weeks after Lip-TAE, we found occlusion of the right branch of portal vein on CT, but she recovered from this condition, and was discharged 1 year later. Case 2. A 62-year-old man was diagnosed as HCC located at S7-6 segments, and was infused with 3 ml of Lip, 150 mg of CBDCA, and 30 mg of Epi-ADM through a right hepatic artery. Ten weeks later, CT showed a cystic lesion in the S7-8 segments, occlusion of the right anterior segmental branch of the portal vein, and the same drainage was also established. Unfortunately, he died of liver failure 18 weeks later. In the literature, biloma after Lip-TAE occurred at 71.2 mean days, ranging from 7 to 180 days, a with remarkable increase in biliary tree-associated enzymes. Seven (35%) of 20 patients died of liver failure or sepsis during 3 weeks and 1 year, and 3 (60%) of 5 patients accompanied by occlusion of a certain portal branch frequently died. We consider that these patients need intensive care and should be under long follow-up.

Adult↗
PubMed1992

Liver regeneration following portacaval shunt in rats: 3',5'-cyclic AMP changes in plasma and liver tissue.

Hepatic regeneration following portacaval shunt was evaluated in the light of the changes of 3',5'-cyclic AMP (cAMP) levels in plasma and liver tissue, and also plasma cAMP levels after glucagon administration, using a 70% hepatectomy and portacaval shunt model in rats. Ratios of liver to body weight recovered to 60% of pre-operative ratios 2 weeks after the operation. Plasma cAMP level decreased slightly, but insignificantly, 1 day and 3 days after the operation, then recovered to the pre-operative level. Hepatic cAMP concentration increased for 2 weeks after the operation. Plasma cAMP levels induced after glucagon administration did not increase until 3 days after the operation and were only 50% of pre-operative levels 4 weeks after the operation. From these results, liver regeneration following the portacaval shunt was remarkably delayed, but continued until at least 2 weeks after the operation.

Animals↗
PubMed1991

Spontaneous rupture of intrahepatic artery aneurysm with complicated vascular anomalies.

An 18-year-old man developed a sudden onset of upper abdominal pain with vomiting. Ultrasound and computed tomographic (CT) scans revealed the spontaneous rupture of an intrahepatic artery aneurysm with subcapsular hematoma. A celiac arteriogram demonstrated a ruptured intrahepatic artery aneurysm in the right lobe of the liver, right extrahepatic artery aneurysm, obliteration of gastroduodenal artery, and abnormal flow pattern of the splenic artery. Portal vein phase, using superior mesenteric arteriography, showed portal vein varices and obliteration of the portal trunk. A right hepatic lobectomy was performed. The cut surface of the resected liver revealed a ruptured intrahepatic artery aneurysm with massive hematoma.

Adolescent↗
PubMed1991

Kinetic changes of liver regeneration and hepatocellular carcinoma cells after partial hepatectomy in rats.

We investigated, using rats, the effect of partial hepatectomy (PH) on hepatocellular carcinoma (HCC, KDH-8 and AH-66) cells, and the effect of HCC cells on the regeneration of remaining hepatocytes after PH. Our results showed that PH significantly enhanced the growth of HCC cells in rats. Tumor volume increased more significantly in the partially hepatectomized group (H-group) than in the control group, and the tumor wet weights on the 14th postoperative day were significantly higher in the H-group than in the control group. Such an enhanced growth effect of PH on the injected (s.c.) HCC cells was related to an abrupt increase of tumor volume within 24 hours after operation, which was supported by the mitotic indices (MI) of the KDH-8 cells. These phenomena of the enhanced growth of the HCC cells following PH were not observed at all in rats injected with estrogen receptor (ER)-negative mammary carcinoma (SST-2) or nonepithelial fibrosarcoma (KMT-75) cells. The MIs of the remaining hepatocytes after PH increased abruptly at the 30th postoperative hour and reached a maximum at the 36th postoperative hour, and the MIs were significantly higher in the H-group with the KDH-8 cells than in the H-group without them from the 42th to the 60th postoperative hour. In the control group, the MIs of hepatocytes were not regardless of the presence of KDH-8 cells. From these results, we speculate that some growth factor(s) induced by PH may act on injected (s.c.) HCC cells, and that the other growth factor(s) secreted by HCC cells may act on the regenerating hepatocytes after PH.

Animals↗
PubMed1991

Late recurrence in neuroblastoma.

Recurrence in neuroblastoma more than 5 years after diagnosis is extremely rare. One case of neuroblastoma recurring 10 years after complete remission from disseminated neuroblastoma at the 5th month of life is reported. Twelve additional cases in the literature are reviewed. Despite the apparent rarity of this event, it should be considered that the patients with disseminated neuroblastoma induced to complete remission without definitive treatment have a potential for late recurrence and should be followed over long periods of time, especially during puberty.

Child, Preschool↗
PubMed1990

Treatment of experimental tumors with a combination of a pulsing magnetic field and an antitumor drug.

We investigated the effects of a combination treatment involving a pulsing magnetic field (PMF) and an antitumor drug, mitomycin C (MMC), on two experimental tumors (fibrosarcoma KMT-17 and hepatocellular carcinoma KDH-8) in WKA rats, paying attention to possible potentiation of the therapeutic effect of the antitumor drug. PMF was obtained using a system generating a pulsed current in a solenoid coil. On day 7 after tumor implantation into the right thighs of rats, the region of the tumor was exposed to PMF (frequency 200 Hz, mean magnetic flux density 40 gauss) for 1 h immediately after iv injection of MMC at a dose of 1 mg/kg. Survival rates at day 90 of KMT-17 implanted rats were 0% (0/10) in the non-treated group, 34% (4/12) in the MMC-treated group, 47% (6/13) in the PMF-treated group and 77% (10/13) in the MMC/PMF combination group. The increase of life span (ILS) of KDH-8-implanted rats in the combination therapy group was significantly prolonged (%ILS 17.6%) compared with that in the MMC-treated (%ILS 3.4%) and PMF-treated (%ILS 7.6%) groups. By using cultured cells of the above two lines of tumor, the therapeutic effects of MMC and PMF were also determined from the cell colony-forming efficiency in soft agar. The colony-forming efficiencies of both cell lines were significantly suppressed in the combination therapy group compared with those in the other single therapy groups. The present results indicate that PMF exhibited a potentiation of the antitumor effect of mitomycin C.

Animals↗