Following a routine immunisation a 9 month old child developed vomiting and drowsiness. On examination there was bulging of anterior fontanelle. Fundoscopy revealed papilledema. The child developed cranial nerve palsies within a few hours. Inspite of all these findings the child was afebrile with clear chest. What is the MOST probable diagnosis?

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Vikas Bhardwaj
Medical Technologist, AIIMS New Delhi
Updated: Apr 17, 2026