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Classification of antrochoanal polyps

Dr Frank Gaillard et al.

CT is the modality of choice for assessment of antrochoanal polyps. A classification system has been proposed:

Stage I : strictly an antronasal polyp
Stage II : if the polyp extends to the nasopharynx and the accessory ostium of the maxillary sinus is occluded fully by the neck of the ACP
Stage III : If the polyp that was extends to the nasopharynx and the accessory ostium of the maxillary sinus is occluded partially by the neck of the polyp