X-ray showing air column between soft tissue mass and posterior wall of the nasopharynx is suggestive of?: (A) Ethmoidal polyp, (B) Antrochoanal polyp, (C) Nasal myiasis, (D) None of the above
Answer is B. In the 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. Ref - PL DHINGRA diseases of ear nose and throat, 7th edition, page no 193