Compression of left renal vein and left common iliac vein on CT scans: how often are they detected?

Abstract Background The nutcracker and May-Thurner syndromes are rare and, although often underdiagnosed, they can cause limiting symptoms. They are frequently considered only after exclusion of other diagnoses and there is no consensus in the literature on prevalence, incidence, or diagnostic criteria. Objectives To estimate the frequency of compression of the left common iliac vein and left renal vein in CT scans of the abdomen and pelvis. Methods Descriptive, quantitative, cross-sectional study. The criteria used to define compression of the left renal vein were a hilar/aortomesenteric diameter ratio > 4 and aortomesenteric angle【背景】胡桃夹综合征（Nutcracker Syndrome）与梅-特伦综合征（May-Thurner Syndrome）较为罕见，且常被漏诊，可引发功能受限的症状。此类疾病通常仅在排除其他诊断后才会被纳入鉴别诊断范畴，目前学界对其患病率、发病率及诊断标准尚未达成统一共识。 【研究目的】本研究旨在评估腹盆部CT扫描中左髂总静脉与左肾静脉受压的发生频率。 【研究方法】本研究为描述性定量横断面研究。左肾静脉受压的判定标准为：肾门-主动脉肠系膜直径比＞4，以及主动脉肠系膜角。