This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cerebrovascular Diseases, Subject name: Surgery
A patient present with unilateral painful ophthalmoplegia. Imaging revealed an enlargement of cavernous sinus on the affected side. The likely diagnosis is: 
Select and explain. 
A. Gradenigo syndrome, B. Cavernous sinus thrombosis, C. Tolosa-Hunt syndrome, D. Orbital Pseudotumor
C: Tolosa-Hunt syndrome
Answer: C: Tolosa-Hunt syndrome 
Explanation: Tolosa - Hunt Syndrome / Orbital Apex Syndrome One of the lesion of orbital apexQ Characterized by painful, acute ophthalmoplegia, with or without involvement of the optic nerve and ophthalmic division (V1) of trigeminal nerveQ Responds promptly to steroid treatment Tolosa described a case in which a mass of granulation material was found around carotid aery in the cavernous sinus and asymmetrical enlargement of cavernous sinus, now referred as Tolosa - Hunt syndromeQ.