Fig. 1

Axial abdominal T2-weighted MRI. a Dilated right ureter. b Inferior vena cava. c Left ureter. Legend: the right ureter (a) traveled to the dorsal side of the inferior vena cava (b) and was compressed by an enlarged fetus, causing hydronephrosis. The dilation of the left ureter (c) was less than that observed in a and is a physiological change seen in pregnant women