EP15.03: Prenatal ultrasonographic and MRI findings of fetal colon in ileal atresia

The maximum diameter of transverse, and sigmoid colon and rectum was measured in the coronal or axial plane. The appearance of whole colon was assessed on T1-weighted sequence (Thin‐slice gradient‐echo, 1.5T) of MRI. Results The mean values of the diameter of transverse and sigmoid colon and rectum were 3.7±1.0mm, 5.7±1.4mm and 6.5±1.3mm, respectively. In 3 cases, it is difficult to identify transverse colon. Microcolon was detected on MRI and the signal intensity of the intraluminal fluid in the dilated bowel were high on T1w sequences (Figure 1a-d). Remaining 18 cases were transient bowel dilation and microcolon was not detected (Figure 2a-d). Discussion