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We report the case of a patient with undifferentiated spondyloarthritis (uSpA) who was successfully treated with abatacept after failing all three available tumour necrosis factor (TNF)α antagonists.
Her disease had begun in 2003 with right buttock pain and asymmetrical peripheral arthritis. Human leukocyte antigen (HLA) typing for the B27 antigen, antibodies to cyclic citrullinated peptide and rheumatoid factor were negative. No erosions were observed on x rays of hands and feet. Since MRI of the sacroiliac joints (SI) showed right sacroiliitis, a diagnosis of uSpA with axial and peripheral joint involvement was made.
During the first 4 years of evolution, the disease was unresponsive to different drugs including non-steroidal anti-inflammatory drugs (NSAIDs), oral and intra-articular …
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