UBE2D1 and solitary fibrous tumor: Having been known by a variety of names in the past, including benign mesothelioma, localized mesothelioma, solitary fibrous mesothelioma, and localized fibrous tumor, to mention a few, hemangiopericytoma has since been replaced with the term solitary fibrous tumor as a result of the identification of the SFT fusion gene [2].