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A 32-year-old man with a metastatic melanoma with an incidentally detected left cerebellopontine angle arachnoid cyst. (a) Axial Fast Spin Echo T2 sequence. T2 hyperintensity is seen in the cerebellopontine angle mass (arrow). (b) DWI sequence. The mass is dark on diffusion-weighted imaging. (c) ADC map. Signal hyperintensity in the lesion on the ADC map (arrow) is present. These findings are consistent with a cyst and exclude other lesions such as an epidermoid.
