No abstract available

[en] Hemangioblastomas are uncommon intracranial neoplasms, constituting approximately 2% of intracranial masses and 7% of all infratentorial tumors in adults. They present frequently (60%) as a cystic cerebellar mass containing a vascular mural nodule. The nodule is isodense with brain before and enhances significatively after contrast medium injection on CT. The cyst has nonenhancing wall and the content of the cyst is generally isodense with the CSF or sometimes slightly denser. Post contrast MRI is the best mean for detecting small mural nodules which have an isointense signal to the brain before contrast media injection. The cyst fluid has the same signal or a slightly higher signal on T1, PD and T2 weighted images. MRI shows in many cases abnormal afferent and efferent vessels that are also demonstrated with angiography. (authors). 58 refs., 8 figs

[en] Imaging of congenital venous anomalies in children or adults includes chest radiograph, angiography, echocardiography, CT scan and MRI. ECG gated MRI of the chest is a noninvasive examination for diagnosis of pulmonary or systemic congenital venous anomalies and it should replace angiography in many cases. The authors describe MR aspects of left superior vena cava, azygos continuation of inferior vena cava and anomalous pulmonary venous returns (total and partial types). MRI provides anatomical data, and gradient echo sequences with flow compensation assess the vascular nature of the anomalous structures. (authors). 44 refs., 6 figs

[en] A case of supracardiac total anomalous pulmonary venous drainage (TAPVD) in an infant aged 2 1/2 months is presented. Diagnosis was established non invasively by magnetic resonance image (MRI). Not only did MRI precisely depict the anomalous venous pathway but it moreover securely excluded pulmonary venous obstruction. (orig.)

[en] Vertebral artery dissection is the first diagnosis that must be suspected by a 40 years old patient with posterior fossa ischemic signs. CT datas from six cases of spontaneous or post-traumatic vertebral artery dissections are reviewed. Cervical CT is performed after contrast medium injection from C7 to CO with 1.5 mm thick slices and a 2 mm gap or with a spiral mod including millimetric reconstruction. The enhancement of the vascular wall, the hypodense hematoma surrounding a stenotic and eccentric lumen, and the enhancement of the artery are typical for a vertebral artery dissection. CT findings were correlated with angiography that is still considered to be the gold standard for this diagnosis. Among noninvasive technics including MRI, duplex scanning and CT, the latter appears very accurate to diagnose vertebral artery dissection. (authors). 13 refs., 4 figs., 2 tabs

[en] Intracranial alveolar echinococcosis is uncommon. We report a patient with right frontal lobe and palpebral lesions secondary to a primary hepatic focus with secondary lesion in the lung. The intracranial and palpebral cystic masses were totally removed and both proved to be alveolar hydatid cysts. An unusual feature in this case is CT and MRI demonstration of dural and bony extension. (orig.)