Correlation of tubal function and volume of mastoid and middle ear space as related to otitis media.

In 69 ears with chronic otitis media and nine ears with traumatic perforations tubal function the size of the mastoid air cell system measured planimetrically on roentgenograms and the functional volume of the air filled ear spaces were studied for any correlations. The roentgenographic area and the functional volume were also studied for any variation in the duration of the disease. A correlation was found between abnormally small volumes and impaired tubal function, probably due to mucosal damage of the whole system, i.e. Eustachian tube, middle ear and mastoid air cells. No such association was found between area and tubal function. The volume, but not the area, decrease with the duration of the disease.