A 25-year-old woman with recurrent pronounced enlargement of the iliop
soas bursae is described; her hips were evaluated by ultrasonography a
nd MRI. They appeared normal and communications to the iliopsoas bursa
e were demonstrated. During the preceding 8 years she had intermittent
seronegative non-erosive arthritis of the knee and finger joints and
her disease was classified as juvenile chronic arthritis.