Although the origin and nature of the ACP remain points of controversy, there is a consensus that the ACP originates in the maxillary sinus and passes through the sinus ostium into the choana.1-3 The ACP can begin as an intramural cyst that obtains its polypoid shape as it protrudes through the maxillary ostium into the nasal cavity4 or it may be polypoid in origin.5 Min et al1 observed that the ACP originates from the maxillary posterior, inferior, lateral, and medial walls in order of decreasing frequency, although some authors have reported the lateral wall as the most frequent site of origin.