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Classification of antrochoanal polyps

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

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