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Biomedical subjects

B I Choi

Publications and source records attributed to B I Choi.

At least 109 records · Page 6Linked to original sources
PubMed1990

CT manifestations of peritoneal leiomyosarcomatosis.

Peritoneal leiomyosarcomatosis causes multiple discrete tumor nodules in the peritoneum, mesentery, and omentum with or without evidence of a primary site. The CT and pathologic findings in seven patients with this disease were reviewed. All seven patients had CT evidence of multiple, discrete peritoneal masses, and five patients showed a central low-attenuation area. CT grade of malignancy in peritoneal tumors was categorized as low (four patients) and high (three patients) on the basis of the degree of central necrosis of the tumors. The CT results correlated with the histopathologic grade of malignancy, although all tumors were grade 2 or higher histopathologically. Ascites and lymphadenopathy were not present in any of the patients. Liver metastases were identified in five patients with central necrosis of the metastases evident in four. The presence of liver metastases and the degree of central necrosis in the liver metastases did not correlate with the size or histologic grade of the primary tumor. Although uncommon, peritoneal leiomyosarcomatosis should be considered when CT shows multiple, discrete peritoneal masses with central necrosis and liver metastases in the absence of ascites and lymphadenopathy.

Adult↗
PubMed1989

Sonographic characteristics of small hepatocellular carcinoma.

Fifty-four lesions of small hepatocellular carcinoma under 5 cm in diameter detected by real-time sonography were reviewed to characterize the sonographic feature. Twenty-nine lesions were smaller than 3 cm in diameter and 25 were between 3 and 5 cm in diameter. Sonographic characteristics of hepatocellular carcinoma were peripheral hypoechoic halo (52%), lateral shadow (26%), posterior acoustic enhancement (44%), and mosaic pattern (24%) of the mass. Small tumors less than 3 cm in diameter showed a hypoechoic pattern in half of the cases, whereas most of the tumors between 3 and 5 cm in diameter showed a hyperechoic or mixed pattern. Posterior acoustic enhancement was commonly seen in small tumors less than 3 cm in diameter, while a mosaic pattern was commonly seen in large tumors between 3 and 5 cm in diameter. These results suggest that sonography might be useful for the characterization of small hepatocellular carcinoma.

Adult↗
PubMed1989

Hepatosplenic tuberculosis with hypersplenism: CT evaluation.

Hepatosplenic tuberculosis of macronodular form is extremely rare. We present one case of hepatosplenic tuberculosis with its appearance on computed tomography (CT). The CT findings of hepatosplenic tuberculosis were multiple, well-defined, round or ovoid, low-density masses with a range of +35 to +45 HU. Lymphadenopathy in the abdominal and mediastinal area and pleural effusion were also found. Although CT does not confirm a diagnosis of hepatosplenic tuberculosis, it is a valuable examination to support the diagnosis and define the extent of disease.

Female↗
PubMed1989

Radiological evaluation of hepatic artery aneurysms.

The authors report 4 cases of hepatic artery aneurysm confirmed by computed tomography, sonography, angiography, and/or surgery. Three aneurysms involved the right hepatic artery and 1 involved the common hepatic artery. Two cases were treated with surgery, and the other 2 cases with transcatheter embolization. The clinical and radiological features of this entity are described together with a review of the pertinent literature.

Adult↗
PubMed1989

Biliary cystadenoma and cystadenocarcinoma: CT and sonographic findings.

Eight women (ages 18-65 years; mean, 47 years) with biliary cystadenoma (n = 3) or cystadenocarcinoma (n = 5) were examined with computed tomography and sonography. The appearance of the tumors varied from unilocular cystic masses to multilocular cystic masses with multiple satellite tumors, although the majority (n = 6) of tumors were single, multilocular, and cystic. Cystic areas showed attenuation numbers under +30 HU. Papillary excrescences, nodular thickening of internal septa, and mural nodules, which showed contrast enhancement, were seen in one case of cystadenoma and all five cases of cystadenocarcinoma. One cystadenoma and one cystadenocarcinoma contained calcifications. Three cases showed connection to the intrahepatic bile ducts. Biliary cystadenoma and cystadenocarcinoma should be the primary diagnostic consideration when one detects in a middle-aged woman a well-encapsulated, multilocular cystic mass connected to the biliary system or prolapsing into the bile duct.

Adult↗
PubMed1989

Hilar cholangiocarcinoma: comparative study with sonography and CT.

Fifty-one patients were studied to determine the relative accuracy of sonography and computed tomography (CT) in the evaluation of hilar cholangiocarcinoma. Both sonography and CT permitted detection of intrahepatic bile duct dilatation in all patients. Nonunion of right and left intrahepatic bile ducts was identified with sonography in 90% and with CT in 94% of patients. The tumor per se was depicted by sonography in 21% and by CT in 40% of patients. Forty tumors (78%) were of the infiltrating type, seven (14%) were exophytic, and four (8%) were polypoid. With sonography, infiltrating and exophytic tumors were difficult to depict, whereas polypoid tumors were well identified. With CT, infiltrating tumors were more difficult to depict than were exophytic or polypoid tumors. On CT scans, depicted tumors of the infiltrating type showed high attenuation and an indistinct margin, whereas exophytic and polypoid tumors showed low attenuation and a well-defined margin. Sonography and CT were comparably accurate in determining the level of obstruction in hilar cholangiocarcinoma even when no mass was depicted. CT was superior to sonography in depicting tumor per se and in demonstrating associated findings.

Adenoma, Bile Duct↗
PubMed1989

Small hepatocellular carcinoma: detection with sonography, computed tomography (CT), angiography and Lipiodol-CT.

Seventy-three small hepatocellular carcinomas under 5 cm in diameter in 47 patients were examined by sonography, computed tomography (CT), hepatic angiography and CT after intra-arterial injection of iodized poppy-seed oil (Lipiodol-CT). The imaging techniques that first led to detection of small hepatocellular carcinomas were sonography in 53 cases (72.6%), CT in 10 (13.7%), angiography in eight (11%) and Lipiodol-CT in two (2.7%). Sensitivity for detecting small hepatocellular carcinomas was 73% with sonography, 82% with CT, 86% with angiography and 96% with Lipiodol-CT. As a screening method, sonographic and CT results in detecting small hepatocellular carcinomas were not significantly different (p greater than 0.05). Lipiodol-CT was superior to sonography (p less than 0.01), CT (p less than 0.01) and angiography (p less than 0.05) in detecting small hepatocellular carcinomas. We believe that the combined use of Lipiodol-CT with screening methods such as sonography or CT is indispensable for the accurate detection of small hepatocellular carcinomas.

Angiography↗
PubMed1989

CT findings of clonorchiasis.

Clonorchiasis is a snail-transmitted trematodiasis caused by Chinese liver fluke, Clonorchis sinensis. Forty-two patients with the disease were examined with CT. Seventeen patients had clonorchiasis alone, and 25 patients had clonorchiasis with hepatobiliary malignancies (20 cholangiocarcinomas, four hepatocellular carcinomas, one carcinoma of the ampulla of Vater). In three of the 17 patients with clonorchiasis alone, the CT scans were normal. In 14 patients (82%), CT showed diffuse, minimal, or mild dilatation of the intrahepatic bile ducts. None of the patients had marked dilatation. The extrahepatic biliary tree was normal in all 17 patients. All 25 patients with clonorchiasis and hepatobiliary malignancies had diffuse dilatation of the intrahepatic bile ducts on CT, including 18 patients with minimal or mild dilatation and seven patients with marked dilatation. All seven patients with marked dilatation had extrahepatic biliary malignancies. Clonorchis sinensis per se or thickening of the bile duct wall could not be recognized on CT scans. Additional abnormalities evident on CT included pyogenic liver abscesses in two patients and gallstones in five patients. The diagnosis of clonorchiasis can be suspected when CT shows diffuse, uniform, and minimal or mild dilatation of the intrahepatic bile ducts, particularly in the periphery of the liver, without evidence of extrahepatic biliary dilatation.

Adenoma, Bile Duct↗
PubMed1989

Giant cavernous hemangioma of the liver: CT and MR imaging in 10 cases.

Ten giant cavernous hemangiomas of the liver in eight patients were examined with both MR imaging and dynamic bolus CT. The maximal diameters of the tumors were 6.5-19 cm (mean, 10.8 cm). MR imaging was done with a 2.0-T superconducting magnet and spin-echo imaging. CT was done with single-bolus dynamic scans. On MR images, all 10 hemangiomas had a heterogeneous appearance. The main part of the tumor comprised uniform, well-defined, high-intensity areas on T2-weighted images, with increasing intensity ratios with prolongation of TR and TE. Other parts of the tumor were cleftlike and were of lower intensity than the remainder of the tumor on T1-weighted images and of higher intensity on heavily T2-weighted images. These parts corresponded to the areas of the tumor that were of lower density on dynamic bolus CT scans. Internal septa in the tumor of low intensity were also noted on all MR pulse sequences. These parts corresponded to low-density areas on delayed contrast-enhanced CT. Familiarity with the characteristics of the internal architecture of giant cavernous hemangiomas on MR imaging or dynamic bolus CT might be useful in making the correct diagnosis of this tumor.

Adult↗
PubMed1988

Sonographic appearance of Krukenberg tumor from gastric carcinoma.

Sonographic findings in 16 cases of Krukenberg tumor from gastric carcinoma were analyzed. The patients' ages ranged from 25 to 52 years (mean 42 years). The tumor involved both ovaries in 14 patients with asymmetrical masses in 9 of 14 cases. Ascites was noted in 15 cases. Echogenicity of the tumor varied from solid to predominantly cystic: solid in 8, mixed in 6, and predominantly cystic in 2 cases. Solid masses tended to be smaller than mixed or cystic masses. The primary gastric carcinoma had been diagnosed before emergence of the tumors in only 7 cases. The findings suggest that in relatively young patients with ovarian mass, particularly bilateral tumors, careful evaluation for gastrointestinal tract involvement should be done.

Adult↗
PubMed1988

Exogastric cystic gastric leiomyoblastoma with unusual CT appearance.

Gastric leiomyoblastomas are rare tumors between leiomyomas and leiomyosarcomas in terms of their malignant potential. This article describes 2 cases of exogastric cystic gastric leiomyoblastoma with unusual location and computed tomographic (CT) appearance. The CT findings of these cases were unlike those of usual smooth muscle tumors, but closely simulated cystadenomatous tumor of the ovary or pancreas.

Aged↗
PubMed1988

Solid and papillary epithelial neoplasms of the pancreas: CT findings.

Five female patients and one male patient with solid and papillary epithelial neoplasms of the pancreas were examined with computed tomography (CT). The mean age of the patients was 27 years (range, 13-46 years). All cases showed well-encapsulated, round or lobulated masses consisting of both cystic and solid areas. Cystic portions showed CT numbers that suggested hemorrhagic necrosis. There were no internal septations within the masses. In three tumors located in the head of the pancreas, dilatation of the biliary tree was absent or minimal, although the masses were large. Two tumors contained calcifications. One tumor demonstrated metastatic deposits in liver and lymph nodes. Metastatic masses appeared similar to the primary pancreatic mass. Solid and papillary neoplasm of the pancreas should be the primary diagnostic consideration when characteristic CT findings are detected in a young female patient.

Adult↗
PubMed1988

Peripheral cholangiocarcinoma and clonorchiasis: CT findings.

Sixteen patients with peripheral cholangiocarcinoma of the liver were examined with computed tomography (CT). None of the 16 patients presented with jaundice or had documented cirrhosis. On scans obtained both before and after the injection of contrast material, the tumors were depicted as low-attenuation masses in all cases, with wide variations in homogeneity. The tumor margin was irregular in 12 cases, and there was minimal contrast enhancement of the tumor in 14 cases. In 11 (69%) patients, CT demonstrated masses of markedly low attenuation, which corresponded to areas of diffuse microcystic change seen at histologic examination of resected specimens. In ten (63%) patients, the results of stool or intradermal tests for Clonorchis sinensis were positive. In all ten cases of clonorchiasis, mild, diffuse dilatation of the intrahepatic bile ducts was seen in addition to the low-attenuation masses, but there was no dilatation of the extrahepatic biliary tree. In five of the ten patients with clonorchiasis, stippled or aggregated, powderlike areas of high attenuation were seen on precontrast CT scans; at pathologic examination, those areas were found to be mucin. Extrahepatic metastases were demonstrated in ten (63%) patients. Peripheral cholangiocarcinoma should be the primary diagnostic consideration when these characteristic CT findings are detected in a noncirrhotic patient.

Adenoma, Bile Duct↗
PubMed1988

Retained surgical sponge: diagnosis with CT and sonography.

The diagnosis of a retained surgical sponge was made by CT and sonography in four patients. The plain abdominal radiograph was normal in all cases. In each of four cases of gauze granuloma, CT showed a well-defined round mass with a thick wall; internal heterogeneous densities with a wavy, striped, and/or spotted appearance; mottled calcifications; and gas bubbles. Sonography disclosed a well-defined hypoechoic mass containing highly echogenic foci with a strong posterior shadow. In these cases, CT and sonographic findings, together with a history of surgery, permitted the correct preoperative diagnosis of a retained foreign body.

Abdomen↗
PubMed1987

Percutaneous removal of residual intrahepatic stones.

In the Orient there is a high frequency of residual intrahepatic stones after biliary tract surgery. Percutaneous removal of residual intrahepatic stones was attempted in a group of 74 patients. Stones were exclusively intrahepatic in 57 patients, whereas 17 patients also had stones in the common bile duct. Biliary strictures were present in 60 cases (81%). A combination of techniques was used, including preshaped angulated catheters, irrigation-suction, balloon dilation of strictures, and crushing of large stones. In 36 cases all stones were removed and in 14 cases most stones were removed, for a success rate of 67.6%. Biliary stricture was the factor most often responsible for failure.

Adolescent↗
PubMed1987

The inferior accessory hepatic fissure: sonographic appearance.

The inferior accessory hepatic fissure, a coronal or parasagittal fissure through the parenchyma of the posterior segment of the right hepatic lobe, was observed sonographically in 15 of 2000 patients. The fissure was seen as a thin, echogenic membrane stretching downward from the right branch of the portal vein to the inferior surface of the right hepatic lobe. On cadaveric sections, the fissure was an invagination of peritoneum directed laterally and slightly posteriorly from the medial inferior surface of the right hepatic lobe below the porta hepatis.

Humans↗