Abstract
A 33-year-old male presented with an acute onset of back pain and abdominal pain. He was 189.9 cm tall and had an arm span of 194 cm, and had mild pectus carinatum as well as arachnodactyly. Plain radiographs showed kyphoscoliosis of the lumbar spine, bamboo spine of the thoracic spine, and sacroiliitis of the pelvis. Abdominal computed tomography revealed debakey type 3 aortic dissection. We prescribed beta blockers to control his blood pressure. According to the modified New York criteria, we diagnosed him with HLA negative ankylosing spondylitis and initiated therapy with nabumetone and sulfasalazine. We later diagnosed Marfan syndrome based on the Ghent criteria and mutation screening at the fibrillin-1. After treatment, he has been followed up without symptoms or complications.