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?: (A) Acute ethmoidal sinusitis, (B) Orbital cellulitis, (C) Cavernous sinus thrombosis, (D) Orbital apex syndrome
Answer is C. 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.