The sinuses are cavities or air-filled pockets near the nasal passage. Like the nasal passage, the sinuses are lined with mucous membranes. There are four different types of sinuses:
ethmoid sinus: located inside the face, around the area of the bridge of the nose. This sinus is present at birth and continues to grow.
maxillary sinus: located inside the face, around the area of the cheeks. This sinus is also present at birth and continues to grow.
frontal sinus: located inside the face, in the area of the forehead. This sinus does not develop until a child is around 7 years old.
sphenoid sinus: located deep in the face, behind the nose. This sinus does not develop until adolescence.
What is sinusitis?
acute sinusitis: occurs quickly and improves with the appropriate treatment
subacute sinusitis: does not improve with treatment initially, and lasts less than three months
- chronic sinusitis: occurs with repeated acute infections or with previous infections that were inadequately treated, and lasts longer than three months