Figure 11. (a, b) Fast low angle shot T₁ Transverse images at the level of mandibular teeth apices and 3 mm inferiorly, showing an area in the midline of reduced medullary (marrow) bone signal. Medullary fatty marrow is normally seen as high signal (white) and the abnormal area is seen as moderate signal (grey). This abnormal area surrounds the roots of lower central incisors, with evidence of considerable thinning of the cortical bone both lingually and buccally, which is seen as a thin black line. Lateral to the abnormal area on both sides there is an area of very low signal (black) in the medullary bone similar to cortical bone, and this indicates sclerosis.