Final answer:
Pansinusitis is a medical condition involving inflammation in more than one but not all of the paranasal sinuses. It can occur when multiple sinuses, such as the maxillary, frontal, ethmoid, and sphenoid sinuses, are affected by infection or inflammation.
Step-by-step explanation:
The question refers to a medical condition called pansinusitis, which involves inflammation and infection in more than one but not all of the paranasal sinuses. The paranasal sinuses are hollow, air-filled spaces named after the skull bone that they occupy. There are several sinuses, including the maxillary, frontal, ethmoid, and sphenoid sinuses. Pansinusitis can occur when multiple sinuses are affected by infection or inflammation.