Keywords: CGS, cutaneous granulocytic sarcoma; GS, granulocytic sarcoma; IHC, immunohistochemistry; KP, Koebner phenomenon; Koebner phenomenon; MDS, myelodysplastic syndrome; MPO, myeloperoxidase; PG, pyoderma gangrenosum; TGF-β1, transforming growth factor-beta 1; TGF-β1R, transforming growth factor-beta 1 receptor; granulocytic sarcoma; myelodysplastic syndrome; transforming growth factor–beta 1 pathway.