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 A patient developed proptosis and diplopia of 2 months duration following injury. On examination there is chemosis, conjunctival redness, and external ocular nerve palsy. Investigation of choice is: and explain in detail?
Ans. (d) Intra-arterial digital subtraction angiographyRef: Kanski 7/e, p. 95, 96History of trauma with proptosis, chemosis and ophthalmoplegia indicates carticocavernous fistula* Investigations: CT and MR may demonstrate prominence of the superior ophthalmic vein and diffuse enlargement of extraocular muscles. The ultimate test, however, is selective arteriography of both internal and external carotid arteries.