<prompt> Horseshoe kidney ascent is prevented by:Superior mesenteric aerySuperior mesenteric veinInferior mesenteric aeryInferior mesenteric vein  <response>: Ascent of horseshoe kidney remains incomplete due to Inferior Mesentric Aery prevents fuher migration of kidney . Isthmus usually located adjacent to L3-L4 veebrae , just below the origin of IMA from abdominal aoa . 