Fig. 1

a Transverse ultrasound image of twin B showing the dilated and thick-walled stomach with a “cut-off” at the second portion of the duodenum (white arrow). Black arrow shows the area of fluctuation of the gastroesophageal junction. b Axial T2-weighted magnetic resonance image of the twin pregnancy showing the dilated fluid-filled stomach with evidence of wall rupture (white arrow) and subsequence ascites (dashed arrow)