CD1D and myeloid sarcoma: When comparing the CD1d‐positive cell density of all MS tissue against control tissue, the density of CD1d‐positive cells was significantly increased in MS compared to healthy tissues (109.5 ± 102.3 cells/mm2 vs. 13.70 ± 9.776 cells/mm2, respectively, P = 0.0184) (Figure 2A).