<prompt> X-ray showing air column between soft tissue mass and posterior wall of the nasopharynx is suggestive ofEthmoidal polypAntrochoanal polypNasal myiasisNone of the above  <response>: In case of antrochoanal polyps, X-ray of paranasal air sinuses may show opacity of the involved antrum. X-ray lateral view of soft tissue nasopharynx, reveals a globular swelling in the postnasal space.It is differentiated from angiofibroma by the presence of a column of air behind the polyp. 