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FIGURE 2. (A) Skeletal scintigram shows high uptake at left-sided transverse-sacral articulation (arrows) of 17-y-old female athlete who had been experiencing low-back pain for 2 y. Abnormality is shown better on anterior (middle) than posterior (left) planar image and is seen better still on SPECT images (axial [top right] and coronal [bottom right]). (B) Radiography findings had been interpreted as normal for this patient, perhaps because bowel gas and contents obscured transverse-sacral articulation, which was clearly shown (arrows) on repeated radiographs (C) after skeletal scintigraphy. Bone along medial margin of transverse-sacral articulation appears sclerotic. Axial (D) and coronal (E) reformatted CT images show cystic changes and sclerosis on either side of transverse-sacral articulation, which is indicated by arrow.
