MRI features most consistent with extensive meningitis with internal septation of the subarachnoid spaces.

This baby was treated for bacterial meningitis (culture-proven for Escherichia coli) and developed antibiotic resistance with status epilepticus.

The internal septation of the subarachnoid spaces is usually seen in the complication phase of bacterial meningitis (including tuberculous origin) with hydrocephalus due to an obstruction at the level of the aqueduct of Sylvius or the 4th ventricle.