The various textbooks on pediatrics give the impression that sinusitis in children is relatively rare. The anatomic fact that at birth there are already two well formed sinuses, the antrum and the ethmoid, together with the frequency of nasal discharge in children, leads one to suspect that perhaps sinusitis is present among children much frequently than is now diagnosed.
The law postulated by Politzer for the middle ear is probably equally true for the nose. Politzer believed that in every instance acute otitis simultaneously involved the accessory air spaces in the mastoid to a greater or lesser degree. I believe that in every instance acute rhinitis involves the accessory nasal sinuses in a similar manner. The anatomic conditions in the nose are somewhat better for drainage in the nasal accessory sinuses than in the ear and so proportionately less severe cases are seen. The frequency of sinusitis must be greater