Sinonasal pleomorphic adenoma generally appears as a well-defined soft tissue mass, most commonly arising from the nasal septum (Pisani et al. 1998) (Fig. 8.46). Bone destruction is unexpected, unless malignant transformation has occurred (Yiotakis et al. 2001b). Ossification has been described in an isolated report (Lee et al. 1992).
As for lesions arising in more typical sites (such as the parotid gland), MR findings consist of T2 hy-perintensity, low to intermediate T1 signal and non-homogeneous enhancement (Yiotakis et al. 2001b; Unlu et al. 2003).
Nonetheless, none of the above-mentioned features support a definitive diagnosis.
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