Obstruction at the bifurcation of aoa leads to

. Obstruction at the bifurcation of aoa causes sudden,rapidly progressive ischemia in both the lower limbs,leads to gangrene of both lower limbs. Note:In aoic bifurcation thrombus,there is earlier history of claudication in the buttock often with LERICH'S SYNDROME.Symptoms are slow and gradual but not dramatic.Collaterals between aoa abd iliac aeries have wrll formed and so sudden.rapid developmet of gangrene will not occur. Refer page no 193 of SRB's manual of surgery 5 th edition.