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Fig. 2 | BMC Gastroenterology

Fig. 2

From: 3D high-resolution anorectal manometry in patients with perianal fistulas: comparison with 3D-anal ultrasound

Fig. 2

Comparison of 3D-HRAM with 3D-EUS in a patient with a fistula. Legend: The fistula tract visualised with 3D-EUS (a) is seen at 3 o’clock in the mid anal canal (on the left side of the patient) and corresponds very well with the pressure profile in (b) the 3D cylinder and (c) folded open 2D image. Note that the representation of the 3D-EUS is facing the patient’s anus, but with the 3D-HRAM left and right are switched, looking at the sphincter from behind. A low pressure “groove” (G) through the anal canal is also seen here. The dotted line is an automatic generated line of lowest pressure, and in this case that coincides with the groove. AS = internal anal sphincter, EAS = external anal sphincter, R = right, L = left, PR = puborectal muscle, ANT = anterior, POST = posterior

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