Fig. 5. Intra-abdominal abscess-muscle fistula and musculocutaneous fistula in a 21-year-old male patient with Crohn’s disease. (A) Postcontrast-enhanced axial computed tomography image shows a fistula between the intra-abdominal abscess and right iliopsoas muscle (white arrow). The patient underwent percutaneous drainage treatment. (B, C) Axial T2-weighted magnetic resonance images with fat saturation after 2 months. The residual abscess is noted in the right lower abdomen (white arrowhead). A tram track-like structure crossing from the peritoneal cavity to the anterior abdominal wall (subcutaneous fat layer and transversus abdominis) can be seen, consistent with musculocutaneous fistula (black arrows).
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