Biomedical subjects

Y Sone

Publications and source records attributed to Y Sone.

111 records · Page 7Linked to original sources

PubMedDate not supplied

Detection of hepatic tumors: arterial-phase MR imaging versus spiral CT arteriography.

BACKGROUND: To compare the utility of arterial-phase magnetic resonance (APMR) imaging and spiral computed tomography arteriography (CTA) for detection of hepatic tumors. METHODS: Both APMR imaging and CTA were performed in 24 patients with liver tumors. APMR imaging was initiated at 25-30 s after an intravenous bolus injection of gadolinium-diethylenetriamine pentaacetic acid using the fast multiplanar spoiled GRASS technique. CTA was initiated at 3 s after hepatic arterial injection of 30-64% nonionic contrast agent. APMR and CTA images were separately reviewed retrospectively by two blinded readers. Afterward, matched pair was reviewed to determine which had better lesion conspicuity. RESULTS: The sensitivities for hepatic tumors were 67.2 and 86.6% in APMR and CTA, respectively (p < 0.01). Seven (12.5%) and 21 (23.9%) false-positive lesions were seen at APMR and CTA, respectively (NS). Lesion conspicuity was comparable between APMR and CTA. CONCLUSIONS: Although APMR imaging is an useful noninvasive method to detect hypervascular liver tumors, APMR imaging is still not an alternative to CTA with respect to tumor detectability.

Aged↗

PubMedDate not supplied

Liver hypertrophy and portal hypertension in association with tumor thrombus in the portal vein: CT findings.

The growth rate of tumor thrombus in the portal vein and the concomitant enlargement of the volumes of the left lateral segment of the liver and the spleen were retrospectively investigated in 11 patients with hepatocellular carcinoma (HCC). In 7 of the 11 patients the left lateral segment of the liver enlarged as the tumor thrombus extended to the right second order branches and the more proximal order branches to the porta hepatis and eventually obstructed these branches. The volume of the left lateral segment was 1.3 to 2.7 times larger, compared with its original volume at the time of HCC detection. An increase in splenic volume was also found in 8 of the 11 patients. The increasing ratios of the splenic volume amounted to 1.3 to 2.1 times the volume found at the time of HCC detection. The growth of tumor thrombus in the right first order branch and portal trunk and the ensuing obstruction of these branches by the tumor thrombus resulted in the development of intractable ascites in 5 of the 11 patients and the development of hepatofugal collateral vessels in all 11 patients. These findings were not demonstrated prior to obstruction of these branches.

Carcinoma, Hepatocellular↗

PubMedDate not supplied

Dynamic MRI of the diaphragm.

OBJECTIVE: To demonstrate the appearance of the diaphragm on single-slice dynamic MRI. MATERIALS AND METHODS: We evaluated the diaphragm using gadolinium-enhanced single-slice dynamic MR in 53 patients. RESULTS: The diaphragm was partially depicted in 49 cases (92.5%). Its thickest part measured 4.4 +/- 2.2 mm, range 3 to 15 mm. Enhanced high-intensity thin layer structures were partially identified between the diaphragm and liver parenchyma in 46 cases (86.8%) at 16 to 144 s (mean +/- SD, 65.7 +/- 32.6 s) after intravenous injection of Gd-DTPA. CONCLUSION: Dynamic MR has value and limitations in demonstrating the diaphragm.

Carcinoma, Hepatocellular↗