Myeloid Sarcoma (MS) is a very rare myeloid neoplasm. The rarity of MS does not enable prospective clinical trials. The OS was worse in secondary AML-related MS compared to de novo AML-related MS. Allo-SCT and the response to CHT significantly improved the OS and DFS. Post-SCT OS is positively influenced by the cGVHD suggesting a Graft vs MS effect.