FLI1 and desmoplastic small round cell tumor: As EWSR1 rearrangement may be found in other tumors such as desmoplastic small round cell tumors [16], a detection of fusion types (EWSR1/FLI-1 and EWSR1/ERG) from RNA is necessary to confirm the diagnosis using reverse transcription polymerase chain reaction (RT-PCR), which is a highly specific method [3, 17].