John P. Deveikis

Learn More
Perfusion computed tomography (CT) is a relatively new technique that allows rapid qualitative and quantitative evaluation of cerebral perfusion by generating maps of cerebral blood flow (CBF), cerebral blood volume (CBV), and mean transit time (MTT). The technique is based on the central volume principle (CBF = CBV/MTT) and requires the use of commercially(More)
Despite the development of new alternative embolic agents, the endovascular treatment of brain arteriovenous malformations continues to frequently require the use of cyanoacrylic glue, especially in situations where particulate or sclerosing agents are ineffective, such as when flow is very rapid or fistulous. Because isobutyl 2-cyanoacrylate (IBCA), the(More)
BACKGROUND AND PURPOSE Differentiation of malignant from benign head and neck lesions is often very difficult on imaging studies, especially in patients with treated cancer. We evaluated the feasibility and reproducibility of perfusion CT (CTP) after enhanced head and neck CT and attempted to differentiate benign from malignant processes. METHODS CTP was(More)
This report analyzes the most frequently observed migration paths of disk fragments in 47 patients who had extruded or sequestered disks. Observations are based principally on magnetic resonance (MR) images. When disk fragments moved in a superior (42%) or inferior (40%) direction from the donor disk, the displaced disk components were most frequently (94%)(More)
PURPOSES We report our experience with sodium methohexital (Brevital) as an anesthetic used in the Wada test for language and memory in 86 epilepsy surgery patients (173 procedures). METHODS The methods are compared with those of the more commonly used anesthetic sodium amobarbital (Amytal). RESULTS Despite differences between the methohexital and(More)
Thrombosis of the deep cerebral venous system is a rare entity with a very poor prognosis. We report two patients with thrombosis of the internal cerebral veins and vein of Galen who responded to local urokinase. We review all 49 cases of deep cerebral venous thrombosis in the English literature. The mortality rate for patients treated with either IV(More)
OBJECTIVE AND IMPORTANCE The vasa vasorum are involved in the pathophysiological development of carotid artery atherosclerosis, providing vascular support to the thickened intima and plaque. When advanced atherosclerosis causes carotid artery occlusion, the vasa vasorum may serve as a means of revascularization. CLINICAL PRESENTATION We studied four(More)
We examined the safety and utility of high-field MR in patients who had surgery for cerebral aneurysms of the vertebrobasilar system. Eighteen posterior (and three coincidental anterior) circulation aneurysms were treated. Twenty-one MR scans were obtained at a mean postoperative interval of 7.2 days. The mean size of the preoperative vertebrobasilar(More)
Treatment and cure of salivary gland neoplasms requires surgical intervention in most cases. For parotid neoplasms, the most common surgical procedure performed is the superficial parotidectomy with facial nerve preservation. Postoperative radiation therapy is indicated in high-grade salivary gland malignancies and malignancies with increased risk of(More)
PURPOSE To present the results of a protocol for embolization in the external carotid territory that includes provocative testing with amobarbital sodium and lidocaine. METHODS Provocative testing with sequential intraarterial injections of amobarbital sodium and lidocaine was done before embolization of 66 vascular pedicles in 26 patients with the(More)