Antrochoanal polyps are unilateral nasal polyps that originate from the maxillary sinus and extend into the choana, which is the space behind the nose where it connects to the throat. These polyps ...

These polyps are growths found in the sinus areas, including the maxillary, ethmoid, frontal, and sphenoid sinuses, although not all patients will have polyps in every sinus. According to Dr.

[13] Also, the demonstration on radiograph of complete opacification of a maxillary sinus often indicates ... useful to delineate the presence of nasal polyps (often hidden from anterior viewing ...