A 3-month-old infant presents with a flat, dark red birthmark over the forehead and upper eyelid (marked B in the diagram). The parents report the lesion was present at birth and has not faded. Ophthalmology screening reveals elevated intraocular pressure. MRI brain shows ipsilateral leptomeningeal enhancement with gyriform calcifications. Which of the following is the MOST important immediate next step in management?

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