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Biomedical subjects

P Stoeter

Publications and source records attributed to P Stoeter.

83 records · Page 5Linked to original sources
PubMed1976

[Moyamoya syndrome of tuberculous cerebral arteritis].

A 55-year old woman, suffering from bacteriologically proven tuberculous meningitis showed the angiographic signs typical of tuberculous arteritis: stenosis of the supraclinoid portion of the carotid syphon on the right stenosis of the basilar artery, multiple peripheral occulsions of mediumsize vessels and mild, internal hydrocephalus. As a rarity there was an unusual collateral supply through the basal Moyamoya net which supplied the occluded right middle branch; there was a transtentorial anastomosis of the left meningeal branch of the vertebral artery which supplied the territory of the right posterior cerebral artery in an orthograde manner. The developmental mechanism and radiological findings of this rare collateral system due to tuberculous meningoarteritis is discussed.

Carotid Arteries↗
PubMed1976

[Radiological examination of embryonal and fetal vessels. Technique and method of prenatal, post-mortem angiography in different stages of gestation].

The development and technique of a x-ray examination for prenatal and post-mortem angiography is presented. After elaboration of an appropriate method for preservation and treatment of the embryos the angiographic procedure was technically evolved and performed on 55 cow-, 40 pig-, and 5 sheep embryos and fetuses with a vertex- breech- length between 11 and 222mm. Selective filling of the arterial and venous system with good opacification of the peripheral vessels and capillary plexus could be regularly achieved by means of thin catheters or extended glass cannulas which were inserted into the umbilical arteries and veins or the vessels of the foetal membrane. By means of this technique the radiological embryology of the vascular development of different species can be studied in great series and investigated with regard to onto- and phylogenetic aspects. This prenatal angiographic technique can also be applied to man as has been proven by angiograms of 4 human embryos and fetuses aged between 6 weeks and 5 months.

Angiography↗
PubMed1975

Rotational cerebral roentgenography. I. Evaluation of the technical procedure and diagnostic application with model studies.

A rotational cerebral roentgenographic technique with a 70 mm camera is elaborated in model studies of the plain and cerebrovascular system. The tube-camera-unit rotates in a semicircle in 5 to 6 seconds around a skull placed in the isocentrum. All special projections of the skull are obtained routinely during one rotational manoeuvre, and intracranial calcifications, foreign bodies and abnormalities of the calvarium are demonstrated sequentially in oblique or tangential views. Studies of the basal cerebral arteries have shown that the localization, size and configuration of arterial aneurysms and stenoses can be demonstrated reliably without changing the position of the skull. An exposure frequency of 6/sec results invariably in excellent stereoscopic views. The diagnostic value and applicability of this technique is discussed.

Cerebral Angiography↗
PubMed1975

Rare and combined vertebrobasilar dysplasias related to vascular maldevelopment at different embryonal stages.

Angiographically demonstrated combined and complex angiodysplasias of the vertebrobasilar system are rare. As in our case, they can be attributed to a vascular maldevelopment in several consecutive embryonal stages: the angioma-like arterial network of the left posterior cerebral artery and the non-union and overcrossing of the vertebral arteries in the region of the prepontine cistern represent an early defect (up to 15 mm stage); the aneurysmatic ectasia of the right vertebral artery with a second pedunculated aneurysm at its uppermost part may be due to a later defect (up to 40 mm stage) of the cerebral vascular development.

Adult↗
PubMed1975

Radiological topography and classification of angioma-like arterial networks in cerebro-vascular collateral circulation.

The radiological appearance and localization of collateral cerebrovascular networks are described. The development and distribution of these arterial networks is due to the site of internal carotid artery stenoses. Including interposed arterial nets, the following types are classified: (1) basal arterial networks near the carotid siphon; (2) arterial networks in the region of the basal ganglia (Moyamoya syndrome); (3) ethmoid arterial networks; (4) arterial networks on the cerebral convexity representing transdural external-internal carotid anastomoses, and (5) circumscribed arterial networks interposed in the course of a major cerebral vessel. The differential diagnostic criteria and aetiological factors of these anastomotic intracranial networks are discussed.

Brain Neoplasms↗
PubMed1975

[Inflammatory cerebro-vascular disease: angiographic findings and distribution patterns (author's transl)].

Although cerebral angiography should be approached with caution in the diagnosis of inflammatory cerebro-vascular disease there are some characteristic angiographic findings which may be helpful for classification and differential diagnosis. The proximal cerebral arteries are favourably affected by basal meningitis and thrombangiitis obliterans with resulting stenoses and occlusions. Whereas those inflammations originating from neighbouring skull structures mostly involve the intracavernous parts of the carotid artery, the tuberculous and mycotic arteritis prefer the supraclinoid carotid siphon. Peripheral vascular changes are found in luetic endangiitis, necrotizing and toxic angiitis and in collagenoses. Simultaneous involvement of the temporal arteries is of great diagnostic importance demonstrating the systemic character of the inflammatory process; in Horton's arteritis it can be a pathognomonic finding. Infectious endocarditis, some mycoses and malaria may lead to embolic occlusion of cerebral vessels. Mycotic aneurysms mostly have a broad base or a fusiform shape and do not prefer the localizations of congenital aneurysms. Angiographically, abscesses, tuberculomas and viral encephalitis may result in circumscribed hypervascularized areas. The characteristic angiographic findings are exemplified and discussed on the basis of 8 cases of inflammatory cerebro-vascular disease (tuberculosis, pneumococcal and unspecific bacterial meningitis, syphilis, mycosis, Takayasu-syndrome, panarteritis nodosa, temporal arteritis).

Adult↗
PubMedDate not supplied

Amygdala-hippocampal atrophy and memory performance in dementia of Alzheimer type.

The aim of the present study was to examine the involvement of brain structures, especially the amygdala-hippocampal complex, in dementia of Alzheimer type (DAT), and to assess the relation of amygdala-hippocampal atrophy with memory dysfunction. 14 patients with DAT and 10 healthy age-matched controls were examined with different neuropsychologic tests including the UCLA-Auditory Verbal Learning Test. MRI was performed with a conventional 1.5-tesla scanner. Atrophy was found in many brain structures of demented subjects in comparison with healthy age-matched controls. The volumes of amygdala-hippocampal complexes and of the temporal lobes of demented subjects were more reduced than the total brain volume and other structures. Memory dysfunction was highly correlated with atrophy of the amygdala-hippocampal complexes and of the temporal lobes. Consequently, DAT seems to affect the amygdala-hippocampal complex and their related function (i.e. memory) more than other cerebral structures, but cerebral degeneration in DAT is not restricted to these structures.

Aged↗
PubMedDate not supplied

[Late sequelae of severe injuries to the viscerocranium: clinical, radiographic and CT findings].

After 1 to 7 years the late results of the surgical treatment of 21 patients with partly severe viscerocranial fractures have been evaluated by means of clinical as well as radiographic and CT examinations (with special thin sections and reconstructions). In demonstrating fractures and hemorrhages or mucosal swelling in the sinuses CT was found to be superior--except for fractures of the floor of the orbita and the nasal bone. Clinical dysfunctions and disorders included among others impaired eye motility (5), optic nerve lesions (2), bone prominences (14; predominantly at the orbital margins, in one case resulting in severe deformity of the face), dental and functional masticatory disorders (10), sinus problems and headache (11). The number of fractures that could be demonstrated by radiography and CT was reduced from 336 to 186, and that of fragment dislocations even to less than a quarter of the original figure. Apart from mucosal swelling and 2 hemorrhages, the sinuses--although in some cases severely injured--were well pneumatized again.

Adolescent↗
PubMedDate not supplied

Intracranial electroencephalographic and evoked-potential recording from intravascular guide wires.

We describe a technique for recording electroencephalographic and evoked-potential information directly from the cerebral hemispheres and brain stem, via an endovascular approach. Recordings were performed with polytef-insulated guide wires in the course of interventional angiographies in 23 patients. All registrations were compared with simultaneous recordings from extracranial electrodes. This preliminary study raises the possibility that this technique may help to explore the electric activity of deep cerebral structures otherwise accessible only by stereotactic puncture or electrode insertion.

Adult↗