Fig. 13From: The different faces of metastatic melanoma in the gastrointestinal tractMRI 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 sigmoidoscopyBack to article page