Bowel ultrasound in a 22-year-old female with ileocolonic Crohn’s disease. In (a) red arrow indicates enteroenteric fistula (defined as a hypoechoic track with a hyperechoic content) between diseased ileal loops with bowel wall thickness (red arrowheads). In (b) a small abscess (white arrowheads identify a roundish anechoic lesions with irregular walls, presenting internal echoes) with fistula (white arrow) was identified in the same patient.
