[Age and other factors in the prognosis and operative indications for brain surgery]

Attempt at evaluation of the operative risk depending on seven factors. 1--For benign tumours (Example: meningiomas): 1--greater than 65 years; 2--functional insufficiency, depending on the type of tumour; 3--the volume of the tumour; 4--site of the tumour; 5--foreseeable operative difficulties; 6--the importance of intra-cranial hypertension and the level of pre-operative consciousness; 7--life expectancy, quantitative and qualitative. II--Extrapolation of the previous equation to malignant tumours, chronic sub-dural hematoma, intra-cerebral hematoma and surgery of pain.