. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 7. Right infantile mastoid in a man of 67, probalily Type3. A few large cells are seen in the tip (A), and alongthe squamo-mastoid suture (B), probably representingrudimentary pneumatic structure. Compare with Fig. 8. Fig. 8. Right mastoid in a girl of eight, showing a few scat-tered large cells, probably rudimentary pneumaticstructure. Compare with Fig. 7. Some Obserxations of Mast(jid Structure. Fig. 9 A. Probably a Type 2 infantile mastoid. At operation,a chronically infected antrum was found deeply situated
. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 7. Right infantile mastoid in a man of 67, probalily Type3. A few large cells are seen in the tip (A), and alongthe squamo-mastoid suture (B), probably representingrudimentary pneumatic structure. Compare with Fig. 8. Fig. 8. Right mastoid in a girl of eight, showing a few scat-tered large cells, probably rudimentary pneumaticstructure. Compare with Fig. 7. Some Obserxations of Mast(jid Structure. Fig. 9 A. Probably a Type 2 infantile mastoid. At operation,a chronically infected antrum was found deeply situatedin dense bone. The possibility of sclerosis cannot beruled out here. Fig. 9 B. Normal mastoid, same case as Fig. 9 A. This mastoidis of the pure pneumatic type. with only a few cells near the tip and a fewback of the middle ear or only the the first instance we are dealing witha Type i infantile mastoid, and in thesecond instance with a Type 2. In suchcases, from an understanding of the patho-logical possibilities, it is desirable to adviseearly exploration of the mastoid is a relatively simple operation, whichwill avoid the possible complications orthe possible transformation into a chronicinfection. The third type of infantile mastoid, inwhich there is a combination of dense wallwith scattered pneumatic cells (Fig. 7j,has all the dangers of the pneumatic typewith regard to spread of infection, and yetwith none of the safeguards that will bementione
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