CC, ISM / SCIENCE PHOTO LIBRARY CC, ISM / SCIENCE PHOTO LIBRARY
Infected frontal sinus. X-ray of the head of a patient with sinusitis (inflammation of the paranasal sinuses). This is a frontal view, showing the frontal sinuses in the forehead (upper centre). The paranasal sinuses are membrane-lined air-filled spaces in the bones of the face. They drain into the nose and throat. Severe colds can develop into an infection and inflammation called sinusitis, where the sinuses fill with mucus and pus. Here, the right frontal sinus (upper left) is cloudy due to the mucus inside it. The other frontal sinus is clear.
Model release not required. Property release not required.