Myelodysplastic syndromes (MDS) are clonal haematopoetic stem cells disorders, characterized by bone marrow dysplasia, ineffecitive haematopoesis and cytopenias. Due to neutropenia, infections are common. A case is presented of a patient with high-risk myelodysplastic syndrome (MDS) complicated by hidradenitis suppurativa that developed in both axillae. Abscesses required multiple incisions and drainage. After five cycles of treatment with azacitidine, the patient underwent allogenic bone marrow transplantation. Unfortunately, six months after the procedure, the patient lost post-transplant chimerism.Treatment with azacitidine was re-started. After the subsequent ten months, blast transformation was observed. Skin lesions in the course of hidradenitis suppurative persisted and were still considerably active.
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