Figure 2b. Normal fast SE STIR whole-body MR images of a 5-year-old girl. Fluid, such as cerebrospinal fluid or contents of the gallbladder or bladder, has the highest signal intensity on STIR images (a, b). Hematopoietic marrow, seen in the central skeleton and proximal femoral metaphyses, is isointense or slightly hyperintense relative to muscle (b, c). Fatty marrow, seen in epiphyses and diaphyses of the lower extremities, is isointense relative to subcutaneous tissue (d). All lymphatic tissue, including the thymus and spleen, exhibits high signal intensity. Normal adenoids, tonsils, and lymph nodes are readily visible (arrows in a, b).