. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 14 normal mastoid, of Type Fig. 14 B. Right mastoid in same patient as Fig. 14 A. Arrowpoints to apparent diploetic structure. Stereoscopicstudy of the plates showed that this was really manylarge pneumatic cells superimposed. lO Some ()bser\-ations of Mastoid Structure while possible by roentgen-ray examina-tion, is usually very difficult. In one case,where a previous operation had disclosed adouble-deck mastoid, a subsequentstereoscopic roentgen-ray study of theother mastoid revealed a condition wh


. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 14 normal mastoid, of Type Fig. 14 B. Right mastoid in same patient as Fig. 14 A. Arrowpoints to apparent diploetic structure. Stereoscopicstudy of the plates showed that this was really manylarge pneumatic cells superimposed. lO Some ()bser\-ations of Mastoid Structure while possible by roentgen-ray examina-tion, is usually very difficult. In one case,where a previous operation had disclosed adouble-deck mastoid, a subsequentstereoscopic roentgen-ray study of theother mastoid revealed a condition whichwas apparently also a any rate the plates showed whatseemed to be an outer layer of cells and adefinite inner layer of thin diploetic struc-ture underlying. Since then two or threecases have been studied in which thedouble-deck condition has been sus-pected from the roentgen-ray examinationalone, and in one case it has been confirmedat subsequent operation. The consideration of this last type bringsout the important point that for a properroentgen-ray study of these various typesof mastoid struct


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