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. 2014 Nov 7;15(6):712–723. doi: 10.3348/kjr.2014.15.6.712

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Copyright © 2014 The Korean Society of Radiology

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 8 — 38-year-old male with semi-horseshoe fistula.

CT fistulography (D-G) and MR imaging (T2-weighted with fat suppression in A-C): transverse, coronal images clearly show circumferential spread of fistula (short white arrows in A-G). Extent of disease and complicated spatial information are better seen on volume rendering image (short arrows in G). External opening (long white arrow in B, E, G), internal opening (short black arrow in D), and secondary ramification (long black arrow in C, F) are seen.