FOSL1 and fibroblastic neoplasm: Hence, detection of FOSL1 rearrangements by targeted sequencing approaches may be the preferred adjunct for the diagnostic work‐up of fibrous tumours: this resolves the challenge of interpreting equivocal immunohistochemistry while simultaneously identifying genetic alterations that may indicate other fibrous tumours, including desmoid‐type fibromatosis, nodular fasciitis and low‐grade fibromyxoid sarcoma.