Comparative study of MR imaging and X-ray in Med-anemia / 中华放射学杂志

ABSTRACT

Objective To evaluate the diagnostic value of MRI and X ray and to analyze MRI and X ray characteristics in Med anemia Methods MRI was performed in thoracic spine,lumbar spine, sacral spine,pelvis,and superior femurs in 15 patients with pathologically proved Med anemia with T 1WI and T 2WI Seven of them were examined on X ray Twenty volunteers were examined on MR as control group The authors analyzed the manifestations of MRI in the Med anemia, including abnormality of signal intensity of bone marrow,T 1 value,vertebral alteration of size and shaped, spinal cord compression due to epidural extramedullary haematopoiesis, and compared with the findings of bone on X ray Results In the control group, bone marrow showed an inhomogeneous iso signal intensity with band shaped, triangular or motley high signal intensity in the middle or back part of the vertebra, neck of the femur on T 1WI and a homogeneous iso signal intensity on T 2WI in the vertebra, pelvis, and superior femur All cases with Med anemia had low homogenous signal intensity in the bone marrow of the vertebra, pelvis and superior femur on T 1WI but had no alterations on T 2WI The spinal cord was constricted resulting from protruding crushed vertebra with bullet like shape in 4 cases The soft tissue masses, confirmed as extramedullary haematopoiesis by operation, were demonstrated in 4 cases Among 7 cases with X ray examinations, 2 cases showed normal on X ray but abnormal bone marrow on MRI, another 5 cases demonstrated bone alteration including osteoporosis, widening of striations, enlargement of ribs and vertebras T 1 value showed (897 4?75 43)ms in the Med anemia group and (401 5?28 1)ms in the control group with significant statistical difference ( P