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Fig. 4B. —False-negative CT findings in 57-year-old man with superficial carcinoma on lingual surface of anterior alveolar ridge. CT scan reconstructed with bone algorithm shows small focal cortical defect (arrow) along lingual surface of alveolar ridge, which corresponded to tumor identified on clinical examination. Because no mass was seen on CT, loss of cortex (arrowheads) was thought to be due to periodontal disease and not neoplastic invasion. This patient was treated with marginal mandibulectomy with no tumor within surgical margins. Pathology revealed small focus of tumor within cortex of resected mandible. This misclassification could be attributed to an error in interpretation because erosion was attributed to periodontal disease and not bone erosion.