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anisocoria; SYMPATHETIC NERVOUS SYSTEM: phenylephrine, mydriasis.In a patient with bilaterally equal pupils prior to surgery, unequal pupil size following anaesthesia is an unsettling finding, suggestive of acute, perioperative intracranial pathology. We report here art unusual cause of anisocoria after anaesthesia. Case reportA four-year-old, green-eyed, 21 kg white female with fibrodysplasia ossificans progressiva was admitted to the hospital for evaluation and elective dental surgery. During physical examination ten days prior to surgery, it was noted that the pupils were equal in size, as was noted during preoperative visits the night before and the morning of surgery.No premedication was administered prior to the patient's arrival in the operating room suite. Anesthesia was induced with rectal methohexitone 25 mg.kg-t, and the patient was taken to the operating room asleep. After application of routine monitors, halothane and N20 in 02 were administered by face mask.An intravenous catheter was inserted and atropine 0.2 mg IV and pancuronium 0.25 mg IV were From the

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