“…The differential diagnosis of pulmonary artery AFH includes septic PE, pulmonary artery fibrous tumor, sarcoma, and so on 2,3,5. Microscopically, a thick fibrous pseudocapsule, infrequent mitoses, blood-filled endothelial-lined cystic cavities, and a rim of dense lymphoplasmacytic infiltrate suggest the diagnosis 8,9. Fluorescence in situ hybridization analysis revealed rearrangement of EWSR, which was confirmed by RT-PCR as EWSR1-ATF1 fusion.…”