Case Report: Ankylosing Spondylitis Complicated With Systemic Lupus Erythematosus.

Ankylosing spondylitis (AS) is rarely found in conjunction with connective tissue diseases. Moreover, reports on the coexistence of AS with systemic lupus erythematosus (SLE) are few. Here, we describe such a case of coexisting AS and SLE in a 58-year-old male patient. He presented with a 5-year history of pain in the lower spine. Immunological tests showed positive results for antinuclear and Sm antibodies. The human leukocyte antigen B27 was also positive. Here, we report a case where AS coexisted with SLE.