. The American journal of roentgenology, radium therapy and nuclear medicine . ^ essential to the properinterpretation. One of the points that impresses theobserver in the study of mastoid structureis the fact that bilateral symmetry is byno means a fixed rule. Generally, of coiu-se,if one type of mastoid exists on one side, theother mastoid will also be of the sametype. But this cannot be taken for a pure pneumatic type ofmastoid will be found on one side, and aninfantile type, with a dense mastoid mass,on the other. (Figs. 9 A and B.) In thelatter instance an infection of
. The American journal of roentgenology, radium therapy and nuclear medicine . ^ essential to the properinterpretation. One of the points that impresses theobserver in the study of mastoid structureis the fact that bilateral symmetry is byno means a fixed rule. Generally, of coiu-se,if one type of mastoid exists on one side, theother mastoid will also be of the sametype. But this cannot be taken for a pure pneumatic type ofmastoid will be found on one side, and aninfantile type, with a dense mastoid mass,on the other. (Figs. 9 A and B.) In thelatter instance an infection of the infantileside may produce a difficult case for diag-nosis. The presence on the healthy sideof a pneumatic mastoid will only be con-fusing, as it may lead the observer to infera similar type on the diseased side, andthus erroneously diagnose an extensivedestruction on the afi^ected side. In sucha case, the clinical findings should beclosely regarded, and the position of thelateral sinus studied. Another important point is the condi-.
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