. Some points in the surgery of the brain and its membranes . thisoperation for i inch, part of which was of a pink colourand inflamed. The next morning patient was little if at all better,and during the afternoon he was drowsy, complained ofheadache, was restless and was sick. The temperaturewas 102°, the pulse came down to 80, the pupils weresomewhat dilated and reacted slowly, tenderness wasmanifest over the right mastoid, and the optic discswere pinker than normal. The same evening anoperation was performed on the right mastoid of anexactly similar character to that which had been carriedo


. Some points in the surgery of the brain and its membranes . thisoperation for i inch, part of which was of a pink colourand inflamed. The next morning patient was little if at all better,and during the afternoon he was drowsy, complained ofheadache, was restless and was sick. The temperaturewas 102°, the pulse came down to 80, the pupils weresomewhat dilated and reacted slowly, tenderness wasmanifest over the right mastoid, and the optic discswere pinker than normal. The same evening anoperation was performed on the right mastoid of anexactly similar character to that which had been carriedout on the left side ; every cell of the pneumaticmastoid was full of pus, and the dura over the lateral OF THE CEREBRAL MEMBRANES 49 sinus and beyond was red. Lumbar puncture was nowdone, and 2 oz. of fluid under pressure were next morning there was no headache, no sickness,no drowsiness, and the pupils reacted well. Convales-cence was rapid, and on both sides practically perfecthearing was regained. Elusion in the pleura or peritoneum gives. Fig. 27.—sketch of complete mastoid operation. In some acute cases tlie dura when exposed is found of a bright red colour. Inthe figure the shaded areas over the antrum and attic, and over the sigmoid sinus,indicate the usual sites of inflammation of the dura. (The complete mastoid opera-tion is only very rarely required in acute cases ; the figure of the complete mastoidoperation is used because it shows clearly the region of the tegmen.) Meningitisserosa may be induced by the inflamed dura, and can be relieved by lumbar puncture. rise to physical signs by which its presence canbe detected quite independently of any symptomsit may cause. Within the skull we are almostentirely dependent upon symptoms for our dia-gnosis, and it may be helpful to consider what wasaccomplished and what was missed when thediagnosis of diseases of the chest was unassisted so SOME POINTS IN THE SURGERY by the means of physical examination nowava


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