which of the following position demonstrates all the paranasal sinuses

which of the following position demonstrates all the paranasal sinuses?

• a. parietoacanthial
• b. PA axial
• c. lateral
• d. true PA***

The true PA position demonstrates all the paranasal sinuses.

Here's why:

• Paranasal sinuses are air-filled cavities located around the nasal cavity. They include the maxillary, frontal, sphenoid, and ethmoid sinuses.
• A true PA (posteroanterior) projection is an X-ray image taken with the patient standing upright and the X-ray beam passing from back to front. This position aligns the X-ray beam with the long axis of the skull, allowing for a clear visualization of all the paranasal sinuses.

Here are the other options and why they are not the best for visualizing all the paranasal sinuses:

- Parietoacanthial:

This position is similar to the true PA but with the head tilted slightly upward. This can obscure the view of the sphenoid sinuses.

- PA axial:

This position is taken with the patient lying down on their back and the X-ray beam passing from front to back. This position does not align the beam with the long axis of the skull, making it difficult to see all the paranasal sinuses.

- Lateral:

This position is taken with the patient lying on their side and the X-ray beam passing from side to side. This position only shows the paranasal sinuses on the side facing the X-ray beam, and it does not provide a good view of the frontal sinuses.

Therefore, the true PA position is the best option for demonstrating all the paranasal sinuses.