Rinsho hoshasen. Clinical radiography最新文献

A watershed infarction is a specific type of a cerebral infarction. This occurs at the border zone between major cerebral arteries. Its CT findings are characteristic as a wedge shaped low density appearing either in the superior frontal region (watershed between anterior and middle and posterior cerebral artery), and always involving the deep white matter onto the ventricle wall. Even though the CT feature is small, a patient, without exception, suffers from neurologic deficit. We studied four cases of a watershed infarction on X-ray CT and compared with 123I-IMP SPECT. DSA was also made to demonstrate an obstruction of an artery which was usually found at the more proximal segment then what we expected from the CT feature. The findings on the 123I-IMP SPECT were better predictable of neurologic symptoms and they were larger in extent than the CT findings.

Computed Tomographic (CT) findings of peripheral-type schwannomas were reviewed and compared with the histology. Ten patients were examined. Plain CT showed all tumors as hypodense mass. After injection of contrast material, they were enhanced in various fashions. The enhancement patterns were divided into four types. On enhancement CT, highly enhanced area in the tumor was consistent with hypercellular region or vascular rich area, whereas poorly stained area revealed hypocellular area, interstitial xanthomatous change or cystic degeneration. It is concluded that the inter-tumoral difference in special distribution of hyper- and hypocellular areas leads to the variety of enhancement pattern on CT images.

A 62-year-old man was admitted to the hospital because of a left upper quadrant mass. He had undergone treatment for hepatocellular carcinoma for 1 year and 7 months. Dynamic CT and angiography revealed a huge hypovascular mass in the spleen. An autopsy confirmed a splenic metastasis of hepatocellular carcinoma with a massive hemorrhage.

A case of 23-year-old female with histologically verified hemangioma of the hypopharynx was reported. MRI revealed slight hyper-intense mass on T1-weighted image while it was very high-signal intensity on T2-weighted image. The dynamic MRI showed peak contrast at 80 seconds after administration of Gd-DTPA. In the present paper the value of MRI for diagnosing hemangioma of the hypopharynx is discussed.

An efficacy of CT in the preoperative staging diagnosis of gallbladder cancer was evaluated. CT findings were recorded following general rules for surgical and pathological studies on cancer of biliary tract proposed by Japanese society of biliary surgery. Serosal invasion (S factor), direct hepatic invasion (H inf factor), lymph node metastasis (N factor), bile duct invasion (B factor), duodenal invasion (Du factor) and finally preoperative staging diagnosis were included in this study. Conclusion is as follows. 1) False positive results were predominating in S and H inf factor, sensitivity was 76.0% and 50.0% respectively. 2) In B factor, the result was poor, the sensitivity 44.4%. 3) In N factor, CT was effective, the sensitivity 77.6%. 4) Finally it was concluded that CT can play an important role in staging diagnosis of gallbladder cancer, the sensitivity was 93.1%.

Reported a case of liposarcoma of the left thigh with accumulation of 99mTc-PYP and Ga-citrate, which was remarkably decreased by transarterial embolization. To our knowledge, this is the first case that concentration of Tc-PYP and Ga-citrate was the useful indicator of the effect of transarterial embolization.

The purpose of this paper is to evaluate the efficacy and limitation of the non-quantitative analysis of renography using 99mTc-DTPA, and to determine the clinical indication of the quantitative analysis of the study. We evaluated the clinical records of the patients and the findings of dynamic imagings and renograms. The non-quantitative analysis of the examination seemed to be useful to the selected cases, and quantitative analysis appeared to be dispensable except for the cases to evaluate the grade of parenchymal damages and causes of asymptomatic hematuria.