Abstract
A follow-up roentgenological functional examination was made on fifty-two patients with chronic maxillary sinusitis of varying intensity for more than three years and the improvement and worsening were studied in relation to season, age, episodes of cold, malformation of the nasal septum and others. From the above stated results, among the various factors which developed and stabilized chronic paranasal sinusitis, three, repeated slight inflammation, abnormal structure in the nasal cavity and predisposition of the sinus mucous membrane, presumably played an important part.
