<prompt> Antral sign is seen in ?Juvenile angiofibromaCSOMSinusitisOtoscelrosis  <response>: Investigations of JNA Following investigations are used in JNA :- i Soft tissue lateral film of nasopharynx :- shows soft tissue mass in the nasopharynx. ii X-rays paranasal sinus and base of skull :- findings have been explained in previous explanation. iii CT scan of head with contrast :- is the investigation of choice. It shows the extent of tumour, bony destruction, or displacement. Anterior bowing of the posterior wall of maxillary sinus antral sign or Hohnan-Miller sign is pathgnomonic of JNA. iv MR1 complementory to CT when soft tissue extensions are present intracranially, in infratemporal foss or in orbit. v Carotid angiography :- shows extension of tumor, its vascularity and feeding vessels. Biopsy should be avoided as it can cause severe bleeding. 