By Zach Koons The four-time Defensive Player of the Year is receiving care from a team of specialists in Atlanta. View the original article to see embedded media. Hall of Famer Dikembe Mutumbo is undergoing treatment for a brain tumor, the NBA said in a statement on behalf of his family Saturday. “NBA Global Ambassador and Basketball Hall of Famer Dikembe Mutumbo is currently undergoing treatment for a brain tumor,” the statement read. “He is receiving the best possible care from a collaborative team of specialists in Atlanta and is in great spirits as he begins treatment. “Dikembe and his fam…