Fig. 4
a Coronal T1-weighted magnetic resonance (MR) image showing two separate esophagi and mirror-imaged stomachs underneath an overarching diaphragm (brown dotted line). b Axial T1-weighted MR image showing the hypoplastic bone in the third upper extremity articulating with a cartilage tissue mass positioned between the left and right scapulae of the right and left twins, most likely representing a glenoid. c Oblique coronal T1-weighted MR image showing the femoral bone in the third lower extremity articulating with a cartilage tissue mass positioned between the left and right iliac bones of the right and left twins, most likely representing an acetabulum