. The American journal of roentgenology, radium therapy and nuclear medicine . /. Fig. I. Case 1. July 31, 1922. Right frontal sinusitis. Fig. 2. Case I. Aug. 23, 1916. Right frontal sinusitis. 2. Infectious diseases, particularly in-fluenza. 3. From the alveolus. About 20 per centof the cases of maxillary sinusitis arethought to originate from an infected tooth. 4. Through contamination from an o\er-lying sinus, such as the frontal or anteriorethmoid cells. 5. Foreign bodies. 6. Traumatism. 7. Osteomyelitis, syphilis, tuberculosisand malignant tumors. All the cases in thisseries come under th


. The American journal of roentgenology, radium therapy and nuclear medicine . /. Fig. I. Case 1. July 31, 1922. Right frontal sinusitis. Fig. 2. Case I. Aug. 23, 1916. Right frontal sinusitis. 2. Infectious diseases, particularly in-fluenza. 3. From the alveolus. About 20 per centof the cases of maxillary sinusitis arethought to originate from an infected tooth. 4. Through contamination from an o\er-lying sinus, such as the frontal or anteriorethmoid cells. 5. Foreign bodies. 6. Traumatism. 7. Osteomyelitis, syphilis, tuberculosisand malignant tumors. All the cases in thisseries come under the first two headings,namely, coryza or influenza, which are themost frequent causes of sinusitis. Infection of the frontal sinus occursmuch the same as infection of the antrum,with two exceptions, namely, the con- pathological changes. Serum and leucocytesescape through the epithelial covering ofthe mucosa, where they mix with bacteria,epithelial debris and mucus. The secretions,at first thin and watery, become thickand tenacious and as the purulent stageprogresses the leucocy


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