The adenoids are a patch of tissue located at the back of the nasal cavity, near the opening of the Eustachian tubes. They are part of the immune system and play a role in filtering out bacteria and viruses that enter the body through the nose. The nasopharynx, on the other hand, is the upper part of the throat behind the nose. An evaluation of the adenoids and nasopharynx can be done through various imaging techniques, including a CT scan. A CT scan of the paranasal sinuses (PNS) can provide detailed images of the adenoids and nasopharynx, allowing healthcare providers to assess their size, shape, and any potential abnormalities.