Renal Artery Thrombosis
		l Occurs in < 1% typically within first month. l Most common cause is acute rejection with retrograde thrombosis of small to large arteries. l Other causes: pediatric kidneys, emboli, acquired stenosis, hypotension, vascular kink, hypercoagulable state, poor anastomosis, trauma l US: Absent arterial and venous flow in kidney and main renal artery.