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Fig. 5B. —False-positive CT of 66-year-old man with left alveolar ridge carcinoma that extended inferiorly along buccal surface of mandible. CT scan reconstructed with bone algorithm shows scalloping of underlying mandible with thinning of cortex (arrows). CT scan was interpreted as showing mandibular invasion. However, no evidence of bony invasion was seen on pathologic examination. This may be due to regressive remodeling of periosteum without direct neoplastic invasion of cortex or medullary cavity.

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