Fluorescence in situ hybridization revealed Ewing Sarcoma Breakpoint Region 1 (EWSR1) rearrangement, and reverse-transcription polymerase chain reaction confirmed the presence of the EWSR1-Activating Transcription Factor 1 (ATF1) fusion transcript, which was subsequently sequenced.    ///    "Fluorescence in situ hybridization revealed Ewing Sarcoma Breakpoint Region 1 (EWSR1) rearrangement, and reverse-transcription polymerase chain reaction confirmed the presence of the EWSR1-Activating Transcription Factor 1 (ATF1) fusion transcript, which was subsequently sequenced. "