are rare inflammatory lesions that arise in the lumen of the maxillary sinus; they herniate through the major or accessory ostium into the nasal cavity and extend into the choanal area.
This case is an interesting example of a unilateral antrochoanal polyp
that resulted in an anterior and superior displacement of the uvula and soft palate.
Sphenochoanal and ethmoidochonal polyps are less common than antrochoanal polyps
Case report of a mass that mimicked an antrochoanal polyp
8,12) CT of the paranasal sinuses is necessary to identify the characteristic features of a sphenochoanal polyp so that it can be differentiated from an antrochoanal polyp
and to determine the anatomic landmarks for endoscopic sinus surgery.
Following correction of the severely deviated septum, endoscopic examination with a 4-mm, 0[degrees] telescope clearly revealed a large antrochoanal polyp
emanating from an accessory ostium of the left maxillary sinus (figure, B).
Unlike antrochoanal polyps
, isolated frontochoanal polyps are not common.
The indications for GESS were chronic sinusitis without polyps (n = 91 operations), with nasal polyps (n = 97), and with antrochoanal polyps
(n = 3).
3,4) Antrochoanal polyps
are far more common than polyps that originate in the ethmoid and sphenoid sinuses.
They were once commonly mistaken for their more common counterparts, antrochoanal polyps
, which produce similar symptoms.
The differential diagnosis of nasopharyngeal cysts includes adenoid hypertrophy, branchial cleft cysts, meningoceles, meningoencephaloceles, antrochoanal polyps
, sphenochoanal polyps, and malignant tumors.
The differential diagnosis of a mass in the postnasal space covers a wide spectrum of pathologies, including antrochoanal polyps
, nasopharyngeal cysts, benign tumors and hamartomas (e.
5) Unlike antrochoanal polyps
, sphenochoanal polyps have a higher chance of exhibiting neoplastic pathology.