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Sinuses are cavities dug in the bones of the face. It exists in the maxillary, in the bone of the forehead, in the bones of the base of the nose (ethmoid).
The starting point is usually an infection of the nose. In the infant, the maxillary and frontal sinuses are not yet formed, but the infection of the ethmoid sinuses exists and can be serious. It is characterized by fever and swelling of the eyelids at the inner corner of the eye.