Arachnoid cysts in children: a European co-operative study.

The data on arachnoid cysts in children (0-15 years) operated upon between 1980 and 1988 were analysed in a retrospective, co-operative study. The results from 285 patients indicate a predominance of these lesions in boys (64%) more than girls (36%) and a mean age of 6 years at onset of symptoms. Focal EEG patterns corresponding to the cyst's location were encountered in 32%.

Cerebrovascular response to changes of cerebral venous pressure and cerebrospinal fluid pressure.

Using parietal cranial windows and multichannel videoangiometry, pial vessel responses were studied in cats during stepwise elevation of superior sagittal sinus pressure (Psss) to a level of 50 mmHg or reduction of CSF-pressure (PCSF). PCSF was monitored via a needle in the great cistern, known from previous studies to be identical to supratentorial CSF-pressure. During elevation of PSSS, large and small pial veins dilated by 14 +/- 6.

[Trifurcations of the middle cerebral arteries].

The furcation types of 100 human middle cerebral arteries (MCA) were investigated. Considering the physiological flow characteristics in furcations, a distinct definition for a bifurcation and a trifurcation was found. The common ramification type of the human MCA is the bifurcation.

[Study of human cerebral blood flow by corrosion casts of the carotid system].

20 corrosion casts of human anterior cerebral arteries and middle cerebral arteries were analyzed. In 588 vessel sections in between 2 bifurcations, the relation of vessel length and vessel diameter was investigated. Measurements were taken starting from the arterial trunk down to vessels with a diameter of 0.