lymphoreticulosis

noun

lym·​pho·​re·​tic·​u·​lo·​sis ˌlim(p)-fō-ri-ˌtik-yə-ˈlō-səs 

plural lymphoreticuloses -ˌsēz 

: proliferation of phagocytic cells and especially macrophages of the lymph nodes

specifically : cat scratch disease