Reverse transcriptase-polymerase chain reaction (RT-PCR) assay revealed one type of CALM/AF10 and three types of AF10/CALM fusion transcripts.     ///    Monocytic leukemia with CALM/AF10 rearrangement showing mediastinal emphysema..     ///    Monocytic leukemias with CALM/AF10 fusion are frequently associated with mediastinal invasion. 