Fig. 5

Patient with carcinoma ex-pleomorphic adenoma of the submandibular gland on the left with invasion of the mandible. In the T2-weighted MR image a the lesion is heterogenously hyperintense to muscle and there is loss of the cortical hypointense line indicating bone invasion (arrow). In the T1-weighted image b the lesion is hypointense to the muscle and there is replacement of the normal high signal marrow fat by the tumour. The T1-weighted image c after injection of gadolinium without fat saturation shows some enhancement of the lesion. Contrast enhanced CT scan at the same level d shows the heterogenously enhancing mass which extends into the mandible. The cortical bone erosion (arrow) is seen better in the bone window setting e. The PET-CT scan f at the same level showing the increased glucose uptake by the tumour with extension into the mandible