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58-years old female patient with perianal fistula, intermittent secretion outflow for 1 year. Oblique axial FS T2WI (A) shows an internal opening at 6 o’clock (yellow arrow). Oblique coronal FS T2WI (B) shows fistula (orange arrow) and external opening (red arrow). FS T2WI: fat suppression T2 weighted imaging.
