A case of conjoined twins (cephalo-thoraco-omphalopagus). The patient had a cesarian section 12 days after the MRI exam, unfortunately, the twins died immediately after.

Ultrasound remains the mainstay of fetal imaging, however, the combination of ultrasound and MRI is superior to ultrasound alone, especially in complex pregnancies such as twin pregnancies and conjoined twins.

MRI is superior to the ultrasound regarding the anatomical details which are useful for preoperative assessment of complex pregnancies as well as difficult cases such as maternal obesity and severe oligohydramnios. The advent of fast imaging sequences in MRI technology has revolutionized the fetal morphological study, especially the use of multiplanar SSFSE (single-shot fast spin-echo) sequence which has improved not only the diagnosis but also the image quality. 

Additional contributor: R. Bouguelaa MD, Z. Boudiaf, MD.