<prompt> A 10-year-old boy presents with nasal obstruction and intermittent profuse epistaxis. He has a firm pinkish mass in the nasopharynx. All of the following investigations are done in this case except-X - ray base of skullCarotid angiographyCT scanBiopsy  <response>: Biopsy can cause profuse bleeding, therefore should be avoided.Investigations used for NFA are :-Soft tissue lateral film of nasopharynxX-ray paranasal sinus and base of skullContrast CT of skull investigation of choiceMRICarotid angiography 