‘Split’ decisions in CNS tumor update
October 2017—Classifying central nervous system tumors has recently become both more complex and easier. Surgical pathologists now have guidance that helps them work through the whys, hows, and what-ifs of using molecular studies when making diagnoses. The 2016 WHO classification for CNS tumors, which has been described as a conceptual and practical advance over the previous incarnation, from 2007, should also help them move closer to precision medicine.