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[X-ray findings in meningiomas of the tentorium cerebelli].

A roentgenological investigation of 38 patients with meningiomas of the tentorium cerebelli of the supra-subtentorial growth revealed signs of hypertension in 31 of them. The destruction of the squama occipitalis and of the superior edge of the apex of the petrous pyramid was found in 17 of these patients. Opacification of the ventricular system discerned a combination that included compression of the inferior contour of the posterior segments of the lateral ventricles or a filling defect of the trigonum of the left ventricle with deformation of the posterior segment of the III ventricle and a displacement forward of the aqueductus Sylvii. An angiographic investigation of the carotid and basilar systems determine a typical picture of simultaneous shifts, viz, upwards--of the median cerebral artery, medially--of the internal occipital artery; outwards--of the temporal-occipital artery, medially and downwards--of the superior cerebral artery. Obliteration of the sinuses rectus and transversalis comes into evidence. Opacification of the meningioma vasculature above and underneath the tentorium cerebelli makes the topical diagnosis quite convincing.