The article describes a clinical case of a 74-year-old patient with pancytopenia, a condition characterized by a reduction in the number of all types of blood cells. Pancytopenia can be caused by various factors including bone marrow disorders, infectious diseases, autoimmune conditions, or adverse drug effects. Diagnosis requires detailed clinical examination, laboratory tests, and often bone marrow biopsy. The case was published in the New England Journal of Medicine in June 2026 and serves as an educational example for the medical community. Correct identification of the underlying cause is crucial for determining appropriate treatment and patient prognosis.