http://www.medindia.net/news/celebratinglife/Lord-Ganesha-Gods-of-Transplant-Surgery-26392-1.htm

"..Ganesha has an elephant's head on the human body. The transplant is believed to have been performed by Lord Shiva. The scientific significance of Ganesha's form may be interpreted as follows-

» Lord Ganesha looks abnormally obese, especially so in the regions of his abdomen and chest. After transplant surgery almost all patients receive steroids leading to a similar obesity. One wonders if Ganesha was on a long-term high dose of steroids after the transplant? No other Indian God is shown with this type of physique...."