Anatomo-functional study of the cerebellum in working memory in children treated for medulloblastoma SUMMARY Introduction and Purpose: Medulloblastoma is the most common malignant cerebral tumor during childhood, arising in the posterior fossa. Children treated for medulloblastoma often experience working memory (WM) deficits, affecting their quality of life and school performance. The aim of the present study undertaken to describe the cerebellar involvement in WM deficits observed in these children. Method: Healthy children and children treated for medulloblastoma were included into study. All subjects performed a detailed neuropsychological examination, an anatomical and functional MRI. Stimuli were presented to the participants with alternating sensory modality and nature of communication in a block design during functional magnetic resonance imaging acquisitions. A Mann- Whitney U test was used for analyzing neuropsychological and behavioral data. The SPM8 and the SUIT (Spatially Unbiased Atlas Template) were utilized for anatomical and functional MRI data. Results : The patients had cerebellar lesions locating principally in the left posterior lobe. These patients were significantly reduced intelligence quotient, central executive and visuospatial WM. In healthy children group, fMRI showed robust activations for nonverbal or visuospatial WM in the left posterior cerebellar lobe. Conclusion: This study provides further evidence that the cerebellum plays a role in WM. Lesions of the left posterior cerebellar lobe may lead to nonverbal WM impairment in children. These finding contribute to treatment planning and to rehabilitation for improving the quality of life of children treated for cerebellar medulloblastoma. Keywords: Medulloblastoma, cerebellum function

Variants of celiac artery in vietnamese adult: descriptive statistic in 378 cases by digital subtraction angiography SUMMARY Introduction: Celiac artery, the first branch is given off from abdominal artery when it passes through diaphragm. It is the major source of blood supply to the supracolic abdominal compartment. Anatomical variations of celiac artery and its branching pattern are frequently found during diagnostic radiological imaging and during surgical exploring in current practice. There are many descriptive statistic of celiac variants published on international journal, it is included in many ethnic and national research, but there is no such the same publish in large number in Vietnameses. Purpose: Descriptive statistic of celiac artery variations by Digital subtraction angiography. Material and Method: Descriptive statistic of celiac artery by using digital subtraction angiography which we have done during treating patients at Interventional Radiology Unit, Gia Định Hospital from March 2011 to July 2015. The result is compared to international published data and contributing to Vietnamese population morphology. Results: of 378 celiac arteries we found that 286 arteries (75.7%) are normal which present all three branches such left gastric artery, splenic artery, and common hepatic artery. The remain are variations with 24.3% in total. Among normal variant, we found that there are many small branches are given of directly from celiac trunk. They are such right or left inferior phrenic arteries or dorsal pancreatic artery, which normally are not come from celiac trunk. But due to using classifications from Michel – Hiatt, Song et al.; Benit et al. and Adachi et al., we have to include those data into normal variations when we see all three branches of it. We also found a rare variant which Song et al. has no case; that is type 14 which common hepatic artery, left gastric artery and superior mesenteric artery are same trunk, while splenic artery is directly off from aorta. Conclusion: With current statistic, we hope to contribute to fulfill morphologic database of Vietnamese as well as international population. Key words: Celiac artery (trunk), Digital subtraction angiography (DSA).

Application of thyroid imaging reporting and data system (TIRADS) in evaluation of thyroid nodules on ultrasound imaging SUMMARY Objectives : To describe sonographic findings of thyroid focal lesions and to evaluate the role of Thyroid Imaging Reporting and Data System (TIRADS) in predicting the malignancy of thyroid focal lesions. Material and methods: Prospective study on 180 patients. Thyroid focal lesions were scored by using TIRADS. The sonographic findings were compared with pathological results. Results: Solid was the most sensitive sonographic indicator of malignancy (93.8%), while the most specific indicator was the taller-than-wide sign (98.2%). The sensitivity, specificity, positive predictive value, negative predictive value and accuracy of TIRADS in predicting the malignancy of thyroid focal lesions were 87.5%, 92.1%, 51.9%, 98.7% and 91.7%, respectively. Conclusion: TIRADS is a simple score which is easy to apply in clinical practice with high diagnostic accuracy. Keywords: Thyroid nodules, ultrasound

Evaluate the initial outcome of endovascular treatment of hemoptysis in Da Nang Hospital SUMMARY Purposes: This study is to evaluate the initial outcome of BAE for moderate, chronic and massive hemoptysis. Materials and methods: Series of 33 patients with the clinical scenario of moderate, chronic and massive haemoptysis was referred to DaNang hospital for digital subtraction angiography and BAE from 2/2009 to 10/2014. Results : The procedure was technically successful in 87.9% (29/33) of patients, within 2 weeks, 78.8% (26/33), within 30 days and 72.7% (24/33), after 30 days. Conclusions : BAE is a useful therapy to control both acute and chronic hemoptysis, BAE may help to avoid surgery in patients who are not good surgical candidates, it is also important to treat the underlying pulmonary desease. Key words : angiography; arterial embolization; bronchial artery; bronchoscopy; hemoptysis.

Transarterial embolization in management of congenital renal arteriovenous malformation SUMMARY Objective: To evaluate the safety and efficacy of transarterial embolization (TAE) in management of congential renal arteriovenous malformation (AVM). Patients and Methods: Between December 2007 and June 2015, 11 patients with congential renal AVM treated with TAE was investigated for clinical presentation, imagine features, treatment methods and complications in Viet Duc hospital. Results: 11 patients (9 women/2 men) with 10/11 gross hematuria, 5/11 flank pain and 1/11 hypertension underwent 11 sessions of treatment, TAE was performed with histoacryl + lipiodol in 7 patients, micro-coils in 3 patients, absolute alcohol and histoacryl in 1 patient. Technical and clinical success were obtained in all patients. There was only 1 patient with fever, renal function was normal in all patient pre - embolization and post - embolization. Conclusion: TAE treatment was safe and effective, it should be recommended as the first choice to treat congential renal AVM. Key word : renal arteriovenous malformation, embolization.

Acoustic Radiation Force Impulse Imaging