You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Investigation of choice for nasopharyngeal angiofibroma? and explain in detail?
Ans. is'd'i.e., CT contrastRef: Dhingra Sth/e p. 262CT scan of head with contrast enhancement is the investigation of choice for JNA.