The antrum is that triangular-shaped cavity in the superior maxilla, sometimes found extending into the malar bone forming a second cavity. It is lined by mucous membrane continuous with that of the nose, and it is occasionally thrown into folds forming partial septa, a fact of considerable clinical importance. It varies in size according to the age and sex of the individual, being small in children, and larger in the male than in the female. It diminishes in size in old age and after the loss of the teeth.
Of the surgical affections of the antrum, suppurative inflammations play the most important part. Until within recent years abscess of the antrum was regarded as rather an uncommon affection, but we now know that it exists much more frequently than was formerly supposed. It occurs generally after the second dentition; although there is one case recorded by P. B. Pedley,1
Bryan JH. Diagnosis and Treatment of Abscess of the Antrum. JAMA. 1983;250(3):395–399. doi:10.1001/jama.1983.03340030055033
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