Which of the following best differentiates antrochoanal polyp from ethmoidal polyp?
- They are multiple
- Best seen on posterior rhinoscopy
- They are bilateral
- Reurrence on polypectomy
- Antrochoanal polyp grows backward (posteriorly), therefore, it may not be visible on anterior rhinoscopy, while posterior rhinoscopy shows smooth, greyish white, spherical mass in choana.
- On the other hand, ethmoidal polyps grow anteriorly. Therefore, they are best seen on anterior rhinoscopy and may not be seen on posterior rhinoscopy.