STAT6 and solitary fibrous tumor: Hemangiopericytoma (HPC), which was first described by Stout and Murray in 1942, is a hypervascular neoplasm originating from the pericytes of Zimmeman that is surrounded by capillary and postcapillary venules.[1] Since 2002, cases of HPC have been grouped under the umbrella term ‘extrapleural solitary fibrous tumors (SFTs)’.[2] Only after NAB2-STAT6 fusion was discovered using whole-exome sequencing was HPC reclassified from SFT to SFT combined with conventional HPC, resulting in a unique entity, SFT/HPC.[3]