{Reference Type}: Case Reports {Title}: A patient with axial spondylarthritis who experienced pancytopenia while receiving anti-TNF therapy. {Author}: Ozbayrak SS;Mesci N;Sezgin MO;Kulcu DG; {Journal}: Clin Rheumatol {Volume}: 43 {Issue}: 8 {Year}: 2024 Aug 6 {Factor}: 3.65 {DOI}: 10.1007/s10067-024-07054-8 {Abstract}: Aplastic anemia is a rare and heterogeneous disease that causes pancytopenia and aplasia of the bone marrow. It is characterized by a failure of hematopoiesis. It is believed that approximately 65% of cases of acquired aplastic anemia are idiopathic. In a subset of cases, a drug or infection is the cause of bone marrow failure. This case report presents a 38-year-old patient with axial spondylarthritis who developed pancytopenia and was diagnosed with aplastic anemia during anti-TNF-α treatment.