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Black ring sign. Invasive CXPA (high-grade mucoepidermoid carcinoma) of the right submandibular gland in a 76-year-old man. MRI shows a nodule with a thick low-intensity rim (A and B, arrows) and an intra-ring component with mixed high- and low-intensity signals on axial and coronal T2WI (A and B). We defined this MRI finding as the black ring sign.
