Table 3. Characteristics of 11 patients with sacroiliitis on magnetic resonance imaging.

Age, disease subtype	MRI findings	X-ray findings (L/R sacroiliac joint)	Inflammatory back pain	HLA-B27
32 year, limited	Chronic	None	Absent	Negative
28 year, limited	Chronic	None	Absent	Negative
29 year, diffuse	Chronic	2/3	Present	Positive
36 year, diffuse	Chronic	None	Absent	Negative
62 year, limited	Chronic	1/3	Present	Negative
33 year, diffuse	Active	None	Absent	Negative
42 year, limited	Active	None	Present	Positive
53 year, diffuse	Active	2/2	Present	Negative
48 year, limited	Active + chronic	2/3	Present	Negative
57 year, limited	Active + chronic	3/4	Present	Positive
46 year, diffuse	Active + chronic	2/3	Present	Negative
MRI: Magnetic resonance imaging; HLA-B27: Human leukocyte antigen B27; L: Left; R: Right.