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. 2022 Oct 4;13:161. doi: 10.1186/s13244-022-01294-5

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Fig. 13 — MRI T1WI and T2WI axial (a, b), PET-CT axial (c) and flexible sigmoidoscopy (d) of a 71-year-old female patient with a metastatic melanoma anorectal mass (arrows). Black pigment is visible within the ulcerated part of the lesion on sigmoidoscopy