Bacterial or viral infections are typically located in the frontal or paranasal sinus infections can lead to inflammation of the frontal sinus called sinusitis nasal polyps can also cause. The frontal sinuses are situated behind the superciliary arches between the outer and inner tables of the frontal bone and they may extend posteriorly till the lesser wings of the sphenoid bone each frontal sinus opens into the middle nasal meatus via the frontonasal duct that opens in the nasal cavity at the hiatus semilunaris. Frontal sinusitis this is a condition affecting the sinuses and is characterized by a swelling of the frontal or ethmoid sinuses it is usually caused due to a blockage or obstruction of the ethmoid sinuses an ethmoid sinus obstruction typically results in a swelling of the frontal sinuses and leads to impaired mucus drainage
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