[Pancytopenia associated to acute myeloid leukemia: a case report of aleukemic leukemia].

Background: Acute myeloid leukemia (AML) is characterized by the presence of ≥ 20% myeloblasts in peripheral blood or bone marrow, as well as specific cytogenetic alterations. It can appear as a de novo disease or be associated with other hematologic diseases, which is why the clinical presentation is heterogeneous. Pancytopenia as a manifestation of aleukemic leukemia is a rare entity. Here, we described a case of AML that presented with pancytopenia as the only manifestation in a secondary care center. Clinical case: 72-year-old man, hospitalized due to pancytopenia, with no history of hematological diseases, asymptomatic, without hepatosplenomegaly or bleeding. Flow cytometry revealed pancytopenia without blasts in peripheral blood. Secondary causes of pancytopenia as infections, splenomegaly and nutritional deficiencies where ruled out. Bone marrow aspirate showed infiltration by 45% of myeloblasts and myelodysplasia. Immunophenotype was compatible with AML. Patient was sent to the Hematology Department at Centro Médico Nacional Siglo XXI (21st Century National Medical Center) to start chemotherapy. Conclusions: AML that is presented as pancytopenia should be considered in the evaluation of marrow failure syndrome. In the context of our hospital, morphological findings remains an essential tool for early diagnosis, since more refined studies such as immunophenotyping and cytogenetic testing are unreachable in a timely manner.