Paranasal refers to the area around or near the nose. More specifically, it commonly describes the paranasal sinuses, which are air-filled cavities located within the bones surrounding the nasal cavity. These hollow spaces are connected to the nasal cavity and play a role in humidifying and warming inhaled air.
Understanding Paranasal Sinuses
The paranasal sinuses are four paired cavities found in the skull and face:
- Frontal sinuses: Located in the forehead, above the eyes.
- Sphenoid sinuses: Situated deep within the skull, behind the nose.
- Ethmoid sinuses: Located between the eyes and nose, comprised of many small air cells.
- Maxillary sinuses: The largest sinuses, found within the cheekbones, below the eyes.
These sinuses are named after the bones in which they reside. Their exact function is still being researched, but they are thought to lighten the skull, contribute to voice resonance, and possibly aid in immune defense. [Source: Cleveland Clinic]
Paranasal Sinuses and Cancer
Cancer can develop in the paranasal sinuses, leading to paranasal sinus cancer. This type of cancer often requires a combination of surgery and radiation therapy for treatment. [Source: National Cancer Institute (NCI)]
The paranasal sinuses are closely associated with the nasal cavity, and cancers can originate in either location. Nasal cavity cancers start in the space behind the nostrils, while paranasal sinus cancers begin in the air-filled spaces around the nose. [Source: American Cancer Society]
In Summary
The term "paranasal" essentially means "near the nose," and it's most commonly used in reference to the paranasal sinuses—air-filled cavities within the skull bones adjacent to the nasal cavity. These sinuses have a complex anatomy and are important to consider in various medical contexts, including the diagnosis and treatment of cancer.
