Unusual presentation of Erdheim-Chester disease in a child with acute lymphoblastic leukemia

Figure 2 Oblique coronal turbo spin-echo T1-weighted (A), turbo spin-echo T2-weighted fat-suppressed (B) and proton-density-weighted fat-suppressed (C) magnetic resonance imaging images of the right shoulder showing a solid expansile intramedullary mass replacing the normal marrow fat; hypointense on T1-weighted images, hyperintense on T2-weighted images. A cortical break in medial upper humeral diaphysis with extension into soft tissue noted. Note another skip lesion in the humeral shaft with similar signal characteristics (white arrow).