We experienced a case of Crohn's disease with psoas abscess. A 30-year-old man was admitted to our hospital for low back pain and an inability to extend the right hip. He had been diagnosed with Crohn's disease 14 years ago. A plain roentgenogram of the abdomen showed scoliosis of the lumbar spine convex to the right side. Psoas abscess was diagnosed by abdominal CT and MRI. The abscess had destroyed part of the psoas muscle which changed to granulation tissue. It was curettaged, drained and treated with antibiotics. Cultures grew Candida species. We thought the abscess was due to candidemia because no fistulous tract was found between the bowel wall and the muscle. The postoperative course was unremarkable.
