Paranasal sinus angiography

The normal paranasal sinuses are air-containing cavities in the craniofacial bone around the nasal cavity. There are four pairs, the maxillary sinus, the frontal sinus, the ethmoid sinus, and the sphenoid sinus. Their inner walls are lined with mucous membranes, each of which has a certain location, shape, and exit. . For structures or organs that lack natural contrast, substances that are higher or lower than the structure or organ can be introduced into the organ or the interstitial space of the common network to make a contrast for development, which is a contrast examination. The introduced substance is called a contrast agent or Contrast.