Choanal Polyp Left  
Choanal Polyp Left 4

Choanal Polyp Left 4

Description : The screenshot shows what happens when the image guidance system loses track of the silver registration spheres.

You can see the tip of the curved suction which has been placed into the maxillary sinus through the natural ostium. Notice how the previously yellow location grids and lost their color. This indicates that the image guidance system is no longer tracking the instrument.

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