Which paranasal sinus is the largest and most commonly involved in sinusitis?

The maxillary sinus is the largest of the paranasal sinuses and is often the most commonly involved in cases of sinusitis. It is located in the cheek area, making it anatomically distinct and more prone to inflammation due to its drainage pathway. The opening of the maxillary sinus into the nasal cavity is situated high in the sinus, which can lead to difficulty in drainage, especially when there is swelling or obstruction from infections or allergies. This anatomical configuration often makes the maxillary sinus susceptible to conditions that lead to sinusitis.

Additionally, factors such as the proximity to the roots of the upper teeth can contribute to infections that spread to the sinus, further increasing the likelihood of maxillary sinus involvement in sinusitis. Understanding the structure and function of the maxillary sinus is crucial in recognizing why it frequently experiences inflammation compared to other sinuses.