MRI Findings of Primary CNS Lymphoma in 26 Immunocompetent Patients

OBJECTIVE: To record the MR imaging features of primary central nervous system lymphoma (PCNSL) and compare these features in monofocal and multifocal disease. MATERIALS AND METHODS: Twenty-one cases of monofocal disease were compared to five cases of multifocal disease. All patients were examined by non-enhanced and contrast-enhanced MRI. Tumor location, tumor size, signal intensity, enhancement characteristics, age distribution, peritumoral edema, cystic changes, and the presence of calcifications were assessed. The MRI features were compared between the monofocal and multifocal disease cases. RESULTS: The 26 cases, including both the monofocal and multifocal cases, exhibited 37 lesions. Contrast-enhanced images showed variable enhancement patterns: homogeneous enhancement (33 lesions), ring-like enhancement (2), and 'open-ring-like' enhancement (2). The 'notch sign' was noted in four of 33 homogeneously enhancing lesions. One case of hemorrhage and three cases of cystic formation were observed. Intra-tumoral calcification was not found. The frontal lobe, the corpus callosum and the basal ganglia were commonly affected in both the monofocal and multifocal groups. Tumor size differed significantly between the two groups (t = 3.129, p 0.05) and the signal characteristics (p > 0.05) between the two groups. CONCLUSION: Our data show that PCNSL has a variable enhancement pattern on MR images. We first reported two lesions with an 'open-ring' enhancement as well as four cases with a 'notch sign'. Monofocal PCNSL cases typically have larger sized tumors with mild or moderate enhancement.

Imaging diagnosis of the vertebral injury in earthquake / 中国骨伤

<p><b>OBJECTIVE</b>To explore the clinical value of imaging diagnosis of the vertebral injury in earthquake.</p><p><b>METHODS</b>Twenty-two cases of the vertebral injury in earthquake with clinical and imaging data were analyzed retrospectively. All of the cases were performed X-ray plain film examination, CT in 20 cases and MRI in 15 cases.</p><p><b>RESULTS</b>Imaging examination can establish definitive diagnosis in all cases. In the 22 cases, the vertebral compression fracture was found in 20 cases, and vertebral bursting fracture in 2 cases,single-level vertebral fracture in 12 case,and multiple-level vertebral fracture in 10 case. Among the 31 vertebral bodies of fracture, the fracture of cervical vertebra, thoracic vertebra, lumbar vertebra and sacral vertebra was found in 3, 12, 14, 2 vertebral bodies, respectively.</p><p><b>CONCLUSION</b>Imaging examination is the most valuable examination method in diagnosis of the vertebral injury in earthquake. It can not only make definitive diagnosis, but also play an important role in selection of therapeutic method.</p>

Hepatic VX2 tumor after portal vein occlusion in rabbits:evaluation with DSA / 介入放射学杂志

Objective To study the value of DSA for hepatic vascular anatomy,and to evaluate the efficacy of portal vein occlusion in rabbits with hepatic VX2 tumor.Methods Twenty New Zealand white rabbits were randomly divided into two groups with 10 in each group,including test group A and positive control group B of ham operation.For the test group A,portal branch ligation(PBL)was performed for the left external branch after 3 weeks of the tumor implantation to the left external lobe.Two weeks later,the DSA of hepatic artery and portal vein were performed in all of the rabbits.Results The total displaying effectiveness of the branches of hepatic artery by DSA was better than that by vascular perfusion.There was hypovascular blood supply to hepatic artery implantation of the tumor in the test group A,comparing with that of the group B.Conclusion DSA can clearly display spacial details of the hepatic vascular anatomy in rabbits,and play an important role in post-procedual evaluation of the portal vein occlusion in rabbits.