You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is true about Horseshoe kidney? and explain in detail?
The lower poles of the two kidneys (or sometimes the upper poles) may be fused. The connecting isthmus may lie either in front of, or behind, the aoa and inferior venacava. The ureters pass anterior to the isthmus. The inferior mesenteric aery also passes anterior to the isthmus which limits the ascent of the horseshoe kidney. (Reference : I B Singh's Embryology , 10th edition, pg 288)