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FIGURE 15. Increasing back pain and deep pelvic discomfort in elderly man. (A–C) Upper frames of CT and 18F fusion showing increased activity across sacrum and compression fractures of L1, L2, L4, and L5. Note buckle fracture of anterior wall of S3 (arrow). (D and E) Lower frames of delayed scan showing numerous areas of increased uptake in lumbar spine but ill-defined cluster of activity across sacrum. (F) MIP of 18F scan. "Connecting the dots" in sacrum identifies early sacral insufficiency fracture.
