A case of May-Thurner-like syndrome was found to be a result of a pelvic kidney compressing the left common iliac vein. Cross-sectional imaging demonstrated transverse mobility of the pelvic kidney which has not been described previously. The ectopic kidney’s mobility resulted in intermittent venous compression. In a patient with recurrent lower extremity deep venous thrombosis and a pelvic kidney, the possibility of movement of the kidney resulting in venous compression needs to be considered.