This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
Antral sign is seen in ? 
Select and explain. 
A. Juvenile angiofibroma, B. CSOM, C. Sinusitis, D. Otoscelrosis
A: Juvenile angiofibroma
Answer: A: Juvenile angiofibroma 
Explanation: 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.