system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A patient with history of running nose and pain over medial aspect of the eye presents with sudden onset of high grade fever, prostration, chemosis, proptosis and diplopia on lateral gaze with congestion of the optic disc. Which of the following is the most likely diagnosis?
assistant
The correct answer is  Ans. (c) Cavernous sinus thrombosisRef: Parson's 20/e, p. 456 - 459.Orbital apex syndrome and orbital cellulitis (MC cause- ethmoidal sinusitis), present with concurrent complete external ophthalmoplegic.