Magnetic resonance imaging findings of carcinoma arising from anal fistula: A retrospective study in a single institution

Figure 1 Magnetic resonance images of a 71-year-old man with mucinous adenocarcinoma. A: Axial T1WI; B: Axial T2WI; C: Sagittal FS-T2WI; D: Axial FS-T2WI. A-D images show that the tumor grew across the midline. This lesion was multiloculated, cauliflower-like, markedly hyperintense on FS-T2WI, with a thin capsule (orange arrows) and focally unclear boundary (orange triangles). E: Axial DWI shows a slightly hyperintense signal with focal hyperintense lesion (orange triangle); F: Axial ADC map shows hyperintense signal with focal hypointense lesion (orange triangle); G-I: Axial dynamic contrast-enhanced images show progressive mesh-like enhancement; K: The tumor was rich in mucus (hematoxylin and eosin staining; original magnification, × 100). T1WI: T1-weighted magnetic resonance imaging; FS-T2WI: Fat-suppressed T2-weighted magnetic resonance imaging.