Quieting Dylan’s brain

To stop seizures that cannot be controlled by medication, doctors at UCLA use a radical surgery that removes deep brain-tissue structures to isolate areas generating the seizures. Without surgery, Dylan Catania’s rare disorder, known as hemimegalencephaly, could have left him severely retarded. Here’s a look at how surgeons used the procedure for Dylan:

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Sources: Gary W. Mathern, M.D.; The CIBA Collection of Medical Illustrations. Graphics reporting by Tom Reinken and Paul Duginski, graphics by Paul Duginski, interactivity by Itzu Chen, Los Angeles Times