Asymmetric conjoined twins: atypical ischiopagus parasite.

The authors report a rare case of asymmetric conjoined twins in which the incomplete parasitic twin was attached to the lumbar area of the autosite. The parasitic twin had well-formed bony pelvis, both lower limbs, partial genitourinary, and gastrointestinal tracts. The parasitic twin was excised, and the exomphalos was repaired.