SLC2A1 and rheumatoid arthritis: Glut1, a glucose transporter protein, was positive in our case and has been reported positive in about 50% of ES but has little value in the differential diagnosis from its dermal mimics as it is also expressed in granuloma annulare and rheumatoid nodules, in benign fibrous histiocytomas and squamous cell carcinomas while it is negative in atypical fibroxanthomas and nodular fasciitis [17].