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Figure 10a. Gastric duplication cyst in a fetus at 28 weeks gestation. (a) Oblique coronal US scan shows an echogenic abdominal mass (calipers), which is suggestive of a meconium pseudocyst. (b–d) m = mass, s = stomach. (b) Sagittal T2-weighted RARE MR image (single shot/60) shows the mass impressing on the stomach. The mass is of slightly lower signal intensity than the stomach on this image. (c) Axial RARE MR image (single shot/60) shows findings similar to those in b. (d) Axial T1-weighted image (126/4, 80° flip angle, 24 x 32-cm field of view, 96 x 256 matrix, 5-mm section thickness, one signal acquired) shows that the mass has slightly lower signal intensity than that of the adjacent stomach. The appearance of the mass suggests a duplication cyst, which was confirmed postnatally.