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A Chonan

Publications and source records attributed to A Chonan.

13 recordsLinked to original sources
PubMed1996

[Diagnosis of superficial-type early carcinoma of the gallbladder by endoscopic ultrasonography--comparison with ultrasonography].

The detectability of superficial-type carcinoma of the gallbladder by ultrasonography (US) and endoscopic ultrasonography (EUS) were investigated. Eight patients with such carcinoma of the gallbladder were reviewed. They had undergone both US and EUS previous to surgery. The tumor was detected in 3 patients by US, 2 patients with IIa + IIb-type carcinoma and 1 patient with IIa-type carcinoma. Those lesions were visualized as localized thickening of the gallbladder wall or as broad-based tumor. In 2 patients, lesions were not initially detected by US, but were shown by US after the examination by EUS. The tumor was detected by EUS also in 1 case of IIb + IIa-type carcinoma besides those 3 patients mentioned above. All four of these lesions were visualized as broad-based tumor by EUS. It was difficult to detect pure IIb-type or small IIa-type carcinoma even by EUS. In patients with concomitant acute cholecystitis or gallbladder stone, it was difficult to evaluate the abnormal findings of the gallbladder wall.

Aged↗
PubMed1996

[Ultrasonographic study of rectal carcinoid tumors].

To compare intraluminal ultrasonographic (ILUS) findings with histological findings of rectal carcinoid tumors, 35 patients with rectal carcinoid tumors were reviewed. The results were as follows: 1) The rectal wall was visualized as a seven- or nine-layer structure by means of ILUS in 81% of the patients. 2) The possibility that the thin hyperechoic third layer above the tumor on ILUS corresponds to the muscularis mucosae and fibrointerstitium above the tumor histologically. 3) In cases with relatively high internal echoes, the amount of fibrointerstitium exceeded that of tumor cells histologically. 4) In cases with nonuniform internal echo patterns, tumor cells were separated by thick fibrointerstitium forming nodular nests.

Carcinoid Tumor↗
PubMed1993

[The evaluation of portal venous invasion of pancreatic cancer by endoscopic ultrasonography].

Thirty-six cases of pancreatic cancer including 27 cases of so-called mucin producing cancer of the pancreas, examined with endoscopic ultrasonography (EUS) and treated with surgery, were reviewed to evaluate the usefulness of EUS in the diagnosis of portal venous (PV) invasion. The detection rate of pancreatic tumors cancer by EUS was 92% in 36 cases. The detection rate of PV invasion by EUS was compared with histological results in each case. Judgement of the correlation between the tumor and the PV wall was possible in 30 cases (83%), and the overall accuracy of EUS in the diagnosis of PV invasion was 73%. It is concluded that EUS is a very useful method for diagnosis of PV invasion in cases of pancreatic cancer.

Adenocarcinoma↗
PubMed1991

[Gastric polyp].

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Adult↗