Figure 4f. Large bone sarcoidosis in a 48-year-old man with left hip pain. (a) Anteroposterior radiograph shows the normal pelvis. (b, c) Coronal T1-weighted (450/8) (b) and fat-saturated intermediate-density-weighted (2,000/15) (c) MR images demonstrate numerous discrete round lesions within the lumbar vertebrae, the pelvis, and both proximal femurs. As seen here, these lesions typically have low signal intensity on T1-weighted images and bright signal intensity on fat-saturated proton-density-weighted images. (d) Close-up view from a coronal fat-saturated intermediate-density-weighted MR image (2,000/15) reveals lesions that have increased signal intensity and form a convex border with the adjacent marrow fat (arrow). (e, f) Coronal T1-weighted (500/8) (e) and fat-saturated intermediate-density-weighted (2,000/15) (f) MR images obtained 7 months later show nearly complete resolution of the previously detected intramedullary lesions. Faint low-signal-intensity ghosts of the lesions persist (arrow in f). The patient did not undergo treatment for sarcoidosis.