CD99 and primitive neuroectodermal tumor: Both PNET and renal carcinoid tumor can demonstrate solid areas and regions of rosettelike structures, although unlike renal carcinoids, PENT is strong immunoreactivity for CD99 and have the t(11; 22)(q24; q12) translocation with the fusion transcript between the EWSR1 gene(22q12) and the FLI gene(11q24) [13].