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(A) Mononuclear cell infiltrates, SIJ biopsy sections of nr-axSpA patients, a 15-year-old man, with HLA-B27+, with a disease duration of 5 months and severe unilateral hip pain. (B) Fibrous tissue resembling a pannus formation. SIJ biopsy sections of a nr-axSpA patient, a 24-year-old woman, who was HLA-B27+, with a disease duration of 8 months and alternating buttock pain. Bars = 50 μm.
