sacroiliac uptake ratios based on 99tcm methylene diphosphonate images were calculated in 14 patients with ankylosing spondylitis , 23 patients with non-specific backache , 33 patients with inflammatory bowel disease ( ulcerative colitis 19 , crohn 's disease 14 ) and 33 control subjects .
C0021390
inflammatory bowel disease
C0010346
crohn 's disease