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Total removal is reported of a parasaggital meningioma that invaded the lateral wall and lateral recess of the posterior third of the superior sagittal sinus. The operation was performed by using a silicone rubber non-collapsible tube with an inflatable balloon cuff at each end for the bypass of the sinus blood, and entailed repair of the defect in the sinus wall by a saphenous vein graft. The clinical results and angiographic findings are presented.

The pH value and the DC potential in the endolymphatic sac (ES) were measured using H⁺-selective double-barreled electrodes and the intra- and extradural approach, the pH value in the ES fluid (6.65 ± 0.12, n = 7) was markedly lower than that in the cerebrospinal fluid (7.39 ± 0.07, n = 7). Acidity in the ES fluid, under normal (nontreated) conditions may be closely associated with metabolism in the epithelium of the ES.

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