Likewise, discordant diagnoses are common in the initial evaluation of IPT-like FDCS, which have been misdiagnosed as Hodgkin lymphoma,[14] malignant fibrous histiocytoma,[15] and myofibroblastic tumor.[11,16] Therefore, when an unusual immunoprofile is observed upon the immunohistochemical examination of a malignant spindle cell tumor, additional immunostaining for CD21, CD23, CD35 could be helpful to rule out FDCS, although this tumor is rare. This evidence concerns the gene CR2 and undifferentiated pleomorphic sarcoma.