. Radiography, x-ray therapeutics and radium therapy . ofthe cells. 6. The foramen magnum, appear-ing as an elliptical opening with part of the first vertebra crossing it. 7. The outline of the pinna of the mastoiditis shows the following departures from the above description : 1. The air cells are obscured, but can still be faintly seen. 2. The outline of the lateral sinus may be a little more defined than normally. 3. The petrous bone is denser. 4. The whole mastoid region is denser. When one gets an absolutely normal mastoid on one side, and the otherside presents the appearance j
. Radiography, x-ray therapeutics and radium therapy . ofthe cells. 6. The foramen magnum, appear-ing as an elliptical opening with part of the first vertebra crossing it. 7. The outline of the pinna of the mastoiditis shows the following departures from the above description : 1. The air cells are obscured, but can still be faintly seen. 2. The outline of the lateral sinus may be a little more defined than normally. 3. The petrous bone is denser. 4. The whole mastoid region is denser. When one gets an absolutely normal mastoid on one side, and the otherside presents the appearance just described, together with certain clinical signsand symptoms, one is justified in diagnosing acute mastoiditis. Chronic mastoiditis is very typical in a skiagraph. It presents the followingdepartures from the normal: 1. The air cells are completely absent. 2. The petrous bone stands out as a very dense, roughly triangular area,with its apex pointing upwards and backwards. 3. The posterior border of the petrous bone forms part of a sharp crescent-. FiG. -Positioii for nidiograpliy of the mastoidsinuses. (Pirie.)
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