[A study of microdensitometric evaluation of opacity of maxillary sinuses in patients with nasal allergy].

The opacity of the maxillary sinuses on X-ray film in Waters' view in patients with nasal allergy was evaluated by a microdensitometer. The patients with nasal allergy were diagnosed with the positive results of the following; 1) eosinophilia in nasal secretion, 2) nasal provocation test, 3) intradermal skin test or radioallergosorbent test (RAST). The ratio of density of the maxillary sinuses and orbits was determined by a microdensitometer, and the ratio of the average degree of the opacity of the maxillary sinus to that of the ipsilateral orbit was designated as the M/O ratio. The normal range of the M/O ratio was set over the mean value -2 standard deviations in the normal group. The results are followings. 1) The abnormal shadows in the maxillary sinuses were found out to be 36.9% in patients with nasal allergy. 2) Patients under 15 years old had significantly higher incidence of abnormal shadows, especially in the bilateral sinuses compared with patients over 15 years old. 3) Polyps in the maxillary sinus were recognized in 5.0% of all the sinuses. 4) There were no significant differences for the incidence of abnormal shadow among the patients with nasal allergy caused by different antigens.