Fig. 2

Warthin’s tumor. A 73-year-old male with malignant melanoma of the back who underwent an ¹⁸F-FDG PET/CT scan for staging. The PET/CT scan (A) showed a highly metabolic lesion in the right parotid gland (star). Fine needle aspiration cytology revealed a Warthin’s tumor. The dorsal part of the lesion is predominantly hypointense on both T1-w axial MRI (B) and T2-w axial MRI (C) with slightly heterogeneous enhancement after injection of contrast as seen on the post-contrast fat saturated T1-w image (D). There is diffusion restriction of the enhancing part with a hyperintense signal on the high b value diffusion-weighted image (E) and a low signal on the ADC map (F). The ventral portion of the lesion (white asterisk) is hypointense on T2-w and hyperintense on T1-w due to some bleeding caused by the fine needle aspiration cytology, which had been performed prior to the MRI