Using oral and intrasinal Na
24 Cl as a tracer, the author investigated the excretion and the abs-orption throngh the mucous membrane of maxillary sinus.
1. The radiation counts of the secretion from teh ostium of maxillary sinus after the oral administration revealed the excretion ability of mucous membrane of maxillary sinus.
2. The derease of the counts suggested the tendency of the mucous membrane to become fibrotic type from catarrhal and purulent type.
3. Similarly, the decrease of the counts suggested the change of glands of the mucous memb-rane from hypertrophic and dilated type to atrophic type.
4. The delay of absorption of Na
24. Cl through the membrane suggested the change of lesion in the mucous membrane from infiltrative type to productive or fibrotic type.
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