Figure 1

Patient 1, a 33 year-old woman. Images demonstrate radiodensity (sclerosis) (radiograph, a) as well as lytic areas (CT, b and c). The lesion is heterogeneous on both T1- (d and e) and T2-weighted (f) sequences and takes up contrast moderately (g and h). The sclerotic aspect on imaging corresponds to classic areas of BNCT: permeative sheets of adipocyte-like tumor cells associated with bone sclerosis and mixed with normal bone marrow islands (i). The round lytic area on imaging (c) corresponds to a centrally emptied notochordal cell lesion without evidence of chordoma at the periphery of the lesion (j). The cystic nature of this lesion is best seen on T2-weighted imaging (f).