<prompt> All the following signs could result from infection within the right cavernous sinus except-Constricted pupil in response to lightEngorgement of the retinal veins upon ophthalmoscopic examinationPtosis of the right eyelidRight ophthalmoplegia  <response>: Cavernous sinus thrombosis Source Infection from nose, sinuses, orbits, ear or pharynxOnset Abrupt with high fever and chills and with signs of toxemia.Cranial N involvement III to VIIOcular featuresPatient develops severe pain in the eye and forehead of the involved side.Conjunctiva is swollen and congestedProptosisPtosis due to 3rd N. palsyOphthalmegia due to palsy of 3rd , 4th and 6th cranial NDilated pupil due to 3rd N involvementRetinal veins shows congestionPapilloedemaFundus may be normal 