Which sinus is located above the eyes and is involved in sinusitis?

The frontal sinus is located above the eyes, situated in the forehead area, just behind the brow ridges. Its proximity to the eyes means that inflammation or infection in the frontal sinus, often due to sinusitis, can lead to characteristic symptoms such as forehead pain, headaches, and pressure around the eyes. The frontal sinus can become congested with mucus, leading to discomfort and contributing to the overall symptoms of sinusitis. In contrast, the other sinuses listed serve different locations: the maxillary sinus is situated in the cheeks, the sphenoidal sinus is located deeper within the skull behind the nose, and the ethmoid sinus is found between the eyes. While all these sinuses can be involved in sinusitis, the specific association of the frontal sinus with the area directly above the eyes highlights why it is considered the correct answer for this question.