Chronic frontal sinusitis is a common condition and many cases are obstinate and difficult to cure. Many of the external operations are disfiguring and often unsuccessful. Intranasal methods are of value in the preliminary treatment in all cases and frequently result in a cure in the early and less obstinate types. The attempt to remove thoroughly the nasal floor of the sinuses by intranasal operating is unwise; first, because it cannot be done without actually inspecting the region, and, second, because the risks are too great. The following cases illustrate a type of operation to be used in all instances in which preliminary intranasal treatment fails to cure, in all cases of fistulas, and in all cases in which an external operation is demanded. All steps of the operation are open to inspection, a minimum scar results, and a maximum opening into the nose persists.
Frontal sinusitis is caused and