Abstract
Examination of angiographic films of 50 sub-tentorial space occupying lesions by means of electronic subtraction demonstrated a tumour circulation in 32% of cases. — The existance of a complete (7 cases) or partial (9 cases) tumour circulation provides topographical and histopathological information, especially in cases of meningioma (5 circulations demonstrated outof 11 cases) and haemangioma (7 circulations demonstrated out of 7 cases). — The position of the tumour within the posterior fossa is also related to the incidence of visualized pathological tumour circulations: a circulation is more often demonstrated in cerebellar and centrally placed tumours than in tumours of the cerebello-pontine angle.
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