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Objective To investigate the hemorrhagic risk factors of cerebral arteriovenous malformations (AVM) on angioarchitecture. Methods 201 cases with AVM diagnosed by digtial subtraction angiography (DSA), including 60 cases by superselective DSA, were devided into two groups. The bleeding group consisted of 138 (68.66%) cases, with ages ranging from 7 to 60 years (average 26 years). The nonbleeding group had 63 (31.34%) cases, whose ages ranged from 11 to 68 years (average 37 years). 14 risk factors with 45 levels were studied by SAS Statistical package. Results The proportion of the total value of square of mean diameters was in partial distribution between the supplying arteries and drainage veins (∑D 2 A/∑D 2 v) in the two groups. Rank sum tests showed significant difference ( P
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Objective To assess the cli ni cal usefulness of dual-modality positron emission tomographic (PET)-computed t omographic (CT) imaging in pulmonary lesions. Methods Fo rty-nine patients with pulmonary lesions examined with ?~2 test. Results There were 50 primary lesions in 49 patients. Accuracy, sensitivity, specificity, positive predictive value (PPV), and negative predict ive value (NPV) were 90.0%, 95.2%, 62.5%, 93.0%, and 71.4%, respectively wi th PET-CT, 74.0%, 76.2%, 62.5%, 91.4%, and 33.3%, respectively with CT. There was significant differences between them (P0.05). Conclusion PET-C T has an important clinical value in differentiating benign lesion from malignan cy and staging in lung cancer.
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Objective To describe the MR appearancses of growth-plate of the developmental long bones,and to study the correlativity of MRI with the anatomy and histology findings.Methods 40 pigs with normal knees were examined by 1.0 T scanning system with various orientations and sequences,MR imagings were compared with the results of sectional anatomy and histology.Results According to MRI,we divided the evolution of growth plate into four developmental stages;the earlier forming stage of growth plate(aged the 80～95 days of pregnancy),the forming stage(aged the 95 days of pregnancy-2 months),the maintaining stage (aged 2 months-3.5 years),the closing stage(aged 3.5～4.5 years).The MRI manifestations of growth plate of knees reflected the findings of sectional anatomy perfectly and histology to a certain extent in each developmental stage.Conclusion MRI is very useful and helpful in dividing the developmental stages of growth-plate,guessing the foundation of anatomy and histology,diagnosing and differentiating all kinds of growth plate lesions.