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(A) Computed tomography (CT) scan and (B and C) three-dimensional reconstruction showing osteolytic destruction of the sacrum and a large soft-tissue mass involving the underlying left ilium. (B) Three-dimensional scan viewed from the front. (C) Three-dimensional scan viewed from behind. The sacral canal was enlarged and the left medial ilium (near sacroiliac joints) was destroyed.
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Three-dimensional reconstructions of computed tomography (CT) scans (Fig. 1) and MRI (Fig. 2) revealed osteolytic destruction of the sacrococcygeal bones, including parts of the first sacral vertebra and underlying left internal ilium, as well as a huge soft-tissue mass measuring 95x75 mm in size.
Plain X-ray of the (A) pelvic and (B) sacroiliac regions six months after surgery, neither of which exhibited any looseness or fractures of internal fixation or new bone destruction.
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Plain X-rays of the pelvic and sacroiliac regions at three months showed no looseness or fractures of internal fixation and no new bone destruction (Fig. 3).