Statement of retraction. Cardioprotective effect of resveratrol via HO-1 expression involves p38 map kinase and PI-3-kinase signaling, but does not involve NFkB.

Free Radical Research, October 2006; 40(10): 1066-1075 (Received 30 March 2006) The Editor, Editorial Board and Publisher of Free Radical Research hereby retract the following article from publication in the journal: SAMARJIT DAS, CESAR G. FRAGA & DIPAK K. DAS.

Optic nerve head drusen. High-resolution computed tomographic approach.

Optic nerve head drusen are rare, inherited concretions, which are almost always calcified; their appearance must be known because they represent one of the major causes of pseudopapilledema. The computed tomographic (CT) scan can show small and buried drusen, which are sometimes difficult to diagnose by the ophthalmoscopic examination. Four cases of drusen (two bilateral and two unilateral) were confirmed or diagnosed by high-resolution CT.

[Acquired stenosis of the lumbar canal and vertebral hyperostosis].

The authors present 12 cases of symptomatic acquired narrowing of the lumbar canal (with multiple nerve root involvement) in patients suffering from typical vertebral hyperostosis. In each case, the lesion was transverse stenosis due to hypertrophy of the articular apophyses of the last three lumbar vertebrae (posteromedial apophyses). Amongst the radiological abnormalities detected, especially with the aid of the C.

Cortical atrophy in Parkinson disease: correlation between clinical and CT findings with special emphasis on prefrontal atrophy.

Thirty-seven patients with Parkinson disease were evaluated clinically and with computed tomography in order to determine the incidence of prefrontal atrophy. An age-matched healthy control group was also scanned. The computed tomographic criteria used were the width of cortical sulci and ventriculocerebral indices.

[Odontoid bone. Apropos of a case].

Reporting a clinical observation, the authors emphasize upon the extreme scarceness of this variety of so called "congenital" pseudarthrosis of the odontoid process. The congenital origin, due to a lack of fusion, or the acquired one by avascular necrosis following a trauma is explained. The diagnosis may be clinical, consisting either on a vertebral syndrome occurring in childhood, or on a neurological syndrome in the adult age.

Electrets for use as dosimeters in radiography.

A compact device for the manufacturing of electrets and for the measurement of the dose to the skin of the patient in radiography has been developed and described. The surface potential of a polarized polymer electret decreases when it is exposed to radiation. The measurement of the variation in surface potential appears to be a reliable method for the evaluation of the dose.

[Dorsal medullary compression in vertebral hyperostosis].

The authors present two observations of dorsal medullary compression by intraspinal benign osseous proliferations developing in subjects who present with anterior vertebral hyperostosis. In the second observation operative intervention confirmed the site and nature of the lesion. The authors have researched the same radiological findings in other cases of vertebral hyperostosis.

Experimental embolization with inflatable and releasable balloons in dogs.

Experimental arterial occlusion was performed on eight dogs by means of inflatable and releasable balloons, in five of which a reliable and long lasting arterial occlusion was obtained. Three accidents occurred. One dog died when the liquid latex was emptied spontaneously from the balloon and the territory was embolized causing a severe general reaction.

Congenital spondylolysis of cervical vertebrae with spondylolisthesis anf frontal narrowing of the spinal canal. Report of two cases.

Two cases of cervical spondylolisthesis, due to a congenital defect in the pars interarticularis of C6, associated with spina bifida and elongation of the contralateral pars interarticularis, are reported. Tomography showed an abnormal direction of the articular facets of C6 and demonstrated a narrow frontal diameter of the cervical spinal canal at the level of the malformation. Gas myelography showed a slight compression of the cord.