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Featured researches published by Isao Doi.


Journal of Gastroenterology | 1998

An autopsy case of granulocytic sarcoma of the porta hepatis causing obstructive jaundice.

Kazuhiro Matsueda; Hiroshi Yamamoto; Isao Doi

Abstract: We describe an extremely rare case of granulocytic sarcoma of the porta hepatis causing obstructive jaundice. The patient was an 84-year-old man admitted because of obstructive jaundice. Ultrasonography (US) and computed tomography (CT) scanning of the abdomen disclosed a mass about 2.5 cm in diameter near the neck of the gallbladder, and thickening of the gallbladder wall. Based on these findings, gallbladder carcinoma was suspected. After endoscopic retrograde biliary drainage (ERBD) was performed, the jaundice resolved. However, blast cells were detected in the peripheral blood 51 days after admission, and laboratory studies disclosed acute myelocytic leukemia (AML: French-American-British [FAB] type M0). We treated him conservatively, with antibiotics and ERBD but he died of disseminated intravascular coagulation. Autopsy showed that the suspected gallbladder carcinoma was actually a granulocytic sarcoma arising in association with AML and causing obstructive jaundice. The largest tumor involved the porta hepatis. It should be kept in mind that granuloctyic sarcoma is a possible cause of obstructive jaundice, even in patients with no evidence of AML.


Journal of Gastroenterology | 2001

Effectiveness of endoscopic biliary drainage for unresectable hepatocellular carcinoma associated with obstructive jaundice.

Kazuhiro Matsueda; Hiroshi Yamamoto; Fumi Umeoka; Toru Ueki; Takeshi Matsumura; Takashi Tezen; Isao Doi

Abstract: Endoscopic biliary drainage (EBD) for unresectable hepatocellular carcinoma (HCC) associated with obstructive jaundice remains controversial because of the short survival of these patients. To evaluate the effectiveness of this procedure, we retrospectively studied 18 patients who had unresectable HCC with obstructive jaundice and underwent EBD with poly-ethylene stents, over a 10-year period. Nine patients with tumor thrombus involving the first branches of the portal vein or portal trunk (Vp3) formed group A and the other 9 (Vp0–Vp2) formed group B. The serum albumin level and serum total bililubin level differed significantly between the two groups (P < 0.05 and P < 0.005, Students t-test), but prothrombin time did not. The obstructive jaundice was mainly caused by direct tumor invasion in 6 patients from group A and 3 from group B, by blood clots and/or tumor fragments in 2 patients from group A and 3 from group B, by the tumor protruding into the common hepatic duct in 2 patients from group B, and by tumor compression of the common bile duct in 1 patient from each group. Drainage was successful in 4 patients (44%) from group A and in all 9 patients (100%) from group B. Among the 5 patients with unsuccessful drainage in group A, 4 had obstruction of both the left and right hepatic ducts and 3 had multiple tumors in both lobes. The mean survival time (mean ± SD) after EBD was 47 ± 44 days in group A and 181 ± 70 days in group B. In group A, the average survival time was only 85 days in the 4 patients with successful drainage. However, an improvement in the quality of life after EBD was observed in one-third of the Vp3 patients and in all of the Vp0–Vp2 patients. In summary, satisfactory palliation is possible with successful EBD, but this is difficult in most patients with Vp3 portal thrombus, direct tumor invasion involving both hepatic ducts, and multiple tumors in both lobes. It is important to determine the site, extent, and nature of the obstruction, as well as liver function and the presence of portal thrombus, before performing EBD.


Acta Gastro-Enterologica Belgica | 1997

TWO CASES OF COLORECTAL CANCER RESEMBLING SUBMUCOSAL TUMOR

Hiromi Hamamoto; Hiroshi Yamamoto; Mituko Kimura; Takahiro Suzuki; Shuji Shima; Kazuhiro Matsueda; Isao Wakiya; Isao Doi; Kei Yano


Acta Gastro-Enterologica Belgica | 1991

CLINICAL STUDY ON SEVENTEEN CASES OF ACUTE HEMORRHAGIC RECTAL ULCER

Hiroshi Yamamoto; Keiko Nagayama; Isao Wakiya; Shigeki Senzaki; Hiroshi Ikeda; Shimako Kawano; Touru Yokoi; Masaki Fukushima; Kazuhiro Matsueda; Isao Doi; Kei Yano


Acta Gastro-Enterologica Belgica | 2003

A CASE OF CECAL VOLVULUS WITH SUCCESS OF REDUCTION BY THE COLONOSCOPE

Atsushi Imagawa; Hiroshi Yamamoto; Kazuhiro Matsueda; Junichi Toshimori; Isao Nozaki; Masakuni Fujii; Daisuke Fujiwara; Takeshi Matumura; Toru Ueki; Yuichi Mouri; Takashi Tezen; Isao Doi


Acta Gastro-Enterologica Belgica | 1997

ACASE OF PANCREATIC ARTERIOVENOUS MALFORMATION CAUSING DUUDENAL HEMORRHAGE

Hiroshi Yamamoto; Kazuhiro Matsueda; Isao Wakiya; Shuji Sima; Hiromi Hamamoto; Takahiro Suzuki; Mituko Kimura; 石山 修平; 杉本 英光; Isao Doi; Kei Yano


Acta Gastro-Enterologica Belgica | 1997

TWO CASES OF DUODENAL VARICES TREATED BY ENDOSCOPIC VARICEAL LIGATION USING O-RINGS

Kazuhiro Matsueda; Hiroshi Yamamoto; Isao Wakiya; Takahiro Suzuki; Hiromi Hamamoto; Yatsuko Kimura; Isao Doi; Kei Yano


The Japanese journal of gastro-enterology | 1996

Four cases of retroperitoneal schwannomas

Eiichiro Yumoto; Hiroshi Yamamoto; Tetsushi Kiyono; Yuuko Asatani; Hiroshi Ikeda; Kazuhiro Matsueda; Isao Wakiya; Isao Doi; Kei Yano


Acta Gastro-Enterologica Belgica | 1995

TWO CASES OF RECTAL CARCINOID TUMOR NEEDED ADDITIONAL RADICAL, OPERATION AFTER L, OCAL EXCISION

Isao Wakiya; Hiroshi Yamamoto; Kazuhiro Matsueda; Hirokazu Mouri; Tatsuaki Nakatou; Kousuke Kihara; Atsushi Miyake; Masaki Fukushima; Isao Doi; 井上 武紀; Kei Yano; Keizo Ogasahara; Hidenari Takasan


The Japanese journal of gastro-enterology | 1993

[Two cases of variceal bleeding associated with portal thrombosis successfully treated with antithrombin-III therapy and sclerotherapy for varices].

Isao Wakiya; Hiroshi Yamamoto; Kazuhiro Matsueda; Ariyoshi M; Yokoi T; Moori H; Shimamura J; Isao Doi; Inoue T; Kei Yano

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