Background: Computer tomograph (CT)is commonly used as a first step in diagnosing tumoursin cerebellopontine angle region.The aim of the work was to evaluate worth of this method in visualisation of temporal bone and posterior cave structures.Material/Methods: The analysis comprises of 46 cerebellopontine angle tumours and temporal bone structure CT examinations performed during 10 years period (between 1987 and 1996).In 25 examinations (matrix of 256x256),by a standard,layer and displacement of the table were 8 mm thick,in 4 cases 4 mm,and in 1 case 2 mm 21 examinations (matrix of 512x512)were conducted with conventional layer of 10 mm thick,in 7 cases -5 mm,in 5 cases -3 mm and in 2 cases -2 mm for visualisation of posterior cave structures.Results: Visualisation and measuring of internal auditory canal and intracanalicular part of acoustic neurinoma was possible in 30-40%of examinations conducted with 10-8 mm layer,in 71-80% with 5-3 mm layer and in 100%of examinations with 2 mm layer.These parameters were possible to diagnose in 73%of the examinations carried out with the bone window independently on the thickness of the layer.Conclusions: Very important by diagnostic of CPA tumours is performing CT examinations with 2-4 mm layers thickness,bone window program and before and after contrast administration.Correctly performed CT examination is highly essential,especially in visualization of bone structures.
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