<prompt> A 16-year-old boy complains of difficulty in breathing through his nose. Endoscopy reveals a tumor infiltrating the nasopharynx. Histology reports this as a juvenile nasopharyngeal haemangiofibroma. The boys anxious mother requests information concerning the lesion. What should she be told?It is a premalignant lesion.It usually occurs with laryngeal obstruction.It is treated with radiotherapy.It may proceed to destroy surrounding bone.  <response>: Juvenile nasopharyngeal haemangiofibromas are rare nonmalignant tumors containing both fibrous and vascular tissue. They occur exclusively among boys. 