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Fig. 5 | Egyptian Journal of Radiology and Nuclear Medicine

Fig. 5

From: Role of endoanal ultrasound in the assessment of perianal fistula in correlation with MRI fistulography

Fig. 5

a, b, c MRI axial and coronal T2 WI images showing left anterior intersphincteric fluid filled fistulous tract with fibrotic wall (yellow arrows) seen ending cranially with small intersphincteric collection abutting the internal sphincter at 12–2 o'clock (blue arrows). d A side branch of high STIR signal is seen arising from the intersphincteric collection abutting the left aspect of the rectum. e, f, h Axial and post reconstruction coronal ultrasound images show left anterior intersphincteric hypoechoic fistulous tract (yellow arrow) seen ending with left intersphincteric collection showing internal echogenic foci /air (abscess) breaching the internal sphincter at 12–2 o'clock (blue arrow). g Ultrasound axial image show hypoechoic side branch arise from the intersphincteric collection and runs posteriorly (red arrow)

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