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Peripheral cholangiocarcinoma: comparison of MRI with CT (1995)

Choi, B. I. ; Han, J. K. ; Shin, Y. M. ; [et al.]

Springer

Abdominal imaging 20 (1995), S. 357-360

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ISSN: 1432-0509

Keywords: Liver ; Cholangiocarcinoma ; CT ; Magnetic resonance ; Liver neoplasm

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract To evaluate the clinical utility of computed tomography (CT) and magnetic resonance imaging (MRI) in the diagnosis of peripheral cholangiocarcinoma of the liver, 11 patients with pathologically proven peripheral cholangiocarcinoma were examined with both CT and MRI. On CT scans in 10 cases, the tumors appeared as irregular, low-attenuation masses with a wide variation in heterogeneity. Contrast enhancement of the tumors was mild in nine cases and moderate in one case, at the periphery. Tumor was not identified in one case. On T1-weighted MRIs, the tumors showed low intensity in eight cases and isointensity in three cases. On T2-weighted images, the tumors showed high intensity in all 11 cases. Focal dilatation of the intrahepatic bile ducts around the tumor was seen in one case on MRIs and in four cases on CT scans. Portal vein invasion of the tumors was seen in one case, and lymphadenopathy was seen in four cases on both MRIs and CT scans. MRI was slightly superior to CT in detecting the tumors, was inferior to CT in delineating focal ductal dilatation around the tumors, and was equal to CT in assessing extent of the tumors.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00203371

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Castleman disease with renal amyloidosis: imaging findings and clinical significance (1995)

Moon, W. K. ; Kim, S. H. ; Im, J.-G. ; [et al.]

Springer

Abdominal imaging 20 (1995), S. 376-378

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ISSN: 1432-0509

Keywords: Amyloidosis ; Hamartoma ; Kidney ; Computed tomography ; Ultrasound

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract We report two cases of renal amyloidosis associated with mesenteric and mediastinal Castleman disease of plasma cell type. Computed tomographic (CT) scan revealed a mesenteric mass with multiple nodal enlargement in one patient and a right paratracheal mass with irregular central calcifications in the second patient. Renal ultrasonography (US) showed increased echogenicity of the renal parenchyma with prominent medullas. Doppler waveform obtained in the kidney associated with mesenteric disease showed complete absence of diastolic flow signal, although it was normal in the patient with mediastinal disease. Recognition of Castleman disease as the cause of renal amyloidosis and the understanding of CT and US findings of this entity are important for the management, as well as its diagnosis.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00203376

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Cerebral sparganosis: analysis of 34 cases with emphasis on CT features (1992)

Chang, K. H. ; Chi, J. G. ; Cho, S. Y. ; [et al.]

Springer

Neuroradiology 34 (1992), S. 1-8

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ISSN: 1432-1920

Keywords: Brain ; Infection ; Computed tomography ; Parasites ; Inflammation ; Sparganosis

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Cerebral sparganosis is a rare parasitic CNS disease, producing chronic active granulomatous inflammation. We retrospectively reviewed the clinical data, CT scans and histopathologic specimens in 34 patients with cerebral sparganosis. The majority of the patients (89%) were rural inhabitants; 75% had a history of ingestion of frogs and/or snakes. The major presenting symptoms were seizure (84%), hemiparesis (59%) and headache (56%) of chronic course. On CT scans, the disease most frequently involved the cerebral hemispheres, particularly frontoparietal lobes, with occasional extension to the external and internal capsules and basal ganglia. The cerebellum was rarely involved. Bilateral involvement was seen in 26%. The main CT findings consisted of white matter hypodensity with adjacent ventricular dilatation (88%), irregular or nodular enhancing lesion (88%), and small punctate calcifications (76%). In combination, the CT triad above appears to be specific for this disease, and was noted in 62% of cases. Of 16 follow-up CT scans, 5 (38%) showed a change in the location of the enhancing nodule. With a single CT scan, it does not appear to be possible to determine whether the worm is alive or dead, information important for deciding whether to intervene surgically. Change in the location of the enhancing nodule and/or worsening of the other CT findings on sequential CT scans would suggest that the worm is alive and that the patient is a candidate for surgery.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00588423

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Re-evaluation of optimal dose of contrast medium for vascular enhancement in CT of the head and neck (1997)

Yoon, D. Y. ; Chang, K. H. ; Han, M. H. ; [et al.]

Springer

Neuroradiology 39 (1997), S. 30-34

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ISSN: 1432-1920

Keywords: Key words Computed tomography ; head and neck ; Contrast medium ; dose ; Comparative study

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Adequate contrast enhancement of major neck vessels is more important than that of a tumour itself in CT of most head and neck tumours because of differentiation from neck node metastases. Our purpose was to re-evaluate the dosage of contrast medium for adequate vascular enhancement in CT of the head and neck. In a blind prospective fashion, 60 patients with a variety of head and neck lesions were randomised into three equal groups receiving 0.75, 1.0, or 1.25 ml/kg of meglumine ioglycate, 300 mg/ml. Contrast medium was administered by injector at 2 ml/s. The scan time and interscan delay were each 1 s, and total scan time 50–180 s. The scan was started immediately after administration of two-thirds of the contrast medium. The degree of vascular enhancement was assessed visually and quantitatively. We visually scored the degree of vascular enhancement as excellent (4 points), good (3), fair (2) or poor (1). For quantitative study, after measuring the CT numbers of the common or internal carotid artery (CA), internal jugular vein (IJV) and adjacent muscle at three levels, were calculated mean vessel/muscle contrast ratios. The degree of enhancement of the CA and IJV tended to increase with dose of the contrast media, but no examination was rated as showing poor enhancement in any group. The mean visual assessment scores for 0.75, 1.0, and 1.25 ml/kg were 2.7, 2.9 and 3.1, respectively; the mean ICA/muscle contrast ratios were 1.58, 1.55 and 1.63, and those of IJV/muscle 1.65, 1.59 and 1.59. There was no significant difference between visual and quantitative assessment in any group. The results suggest that 0.75 ml/kg of contrast medium appears sufficient for vascular opacification for head and neck lesions when the CT scan can be completed in about 120 s.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s002340050362

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