Cephalopagus is a rare variety of conjoined twins. They are fused with their 
heads, thoracic and upper abdominal cavities. The exact mechanism for 
development of conjoined twins cannot be clearly explained. It appears that 
there is an alteration in the normal developmental process of monozygotic twins, 
which fail to separate from each other. We present the morphology of a 
cephalothoracopagus, revealed through anatomical dissection, emphasizing the 
arrangement of the viscera in the thoracic and abdominal cavities. They are 
fused with their heads, thoracic and upper abdominal cavities. The lower abdomen 
and pelvic cavities are free. Each twin has two upper and lower limbs, normally 
shaped. Each twin has a heart and two lungs. There is a single pharynx, 
esophagus and stomach, but normal lower abdominal systems. The genital and 
urinary systems are apparently normal. Due to the fusion of the heads and 
abnormal arrangement of the superior central nervous system, surgery is not 
attempted in these cases, the prognosis being very poor.