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Published on: June 2, 2015
Classification of the renal vein variations: a study with multidetector computed tomography
Jingqi Zhu1, Lei Zhang, Zhangwei Yang
1Department of Radiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Middle Yanchang Road, Shanghai, 200072, China.
Insights
Renal vein variations are common, especially in the right renal vein. Multidetector computed tomography (MDCT) effectively visualizes these variations, aiding in preoperative recognition of renal vein anatomy.
Area of Science:
- Radiology
- Anatomy
- Vascular Imaging
Background:
- Renal vein variations can impact surgical procedures and diagnostic interpretations.
- Accurate anatomical knowledge is crucial for urological and radiological interventions.
Purpose of the Study:
- To determine the incidence and types of renal vein variations using multidetector computed tomography (MDCT).
- To characterize the anatomical features of left and right renal vein variations in an adult population.
Main Methods:
- Retrospective analysis of 1,452 patients who underwent MDCT angiography.
- Evaluation of renal vein variations including number, length, origin, destination, branching pattern, and course.
- Statistical comparison of variation incidence between left and right renal veins and between genders.
Main Results:
- Renal vein variations were found in 24.7% of patients.
- Right renal vein variations (19.2%) were more frequent than left renal vein variations (7.1%).
- Left renal vein variations exhibited greater complexity with five classified types, while right renal vein variations had three types, including a high incidence of additional renal veins (18.7%).
Conclusions:
- Renal vein variations are not uncommon, with a higher prevalence in the right renal vein.
- Left renal vein anomalies are more complex than right renal vein anomalies.
- MDCT angiography is a valuable tool for depicting renal vein anatomy, and a new classification aids in preoperative identification of variations.
Purpose:
To estimate the incidence, anatomical feature as well as type of the renal vein variation with multidetector computed tomography (MDCT) in an adult population.
Methods:
A total of 1,452 patients who underwent MDCT angiography were retrospectively evaluated for the presence (number, length, origination, destination, branching pattern and course) of the renal vein variation. χ² test was used to compare the incidence of variations in left and right renal veins and the incidence of variations in each side renal vein between males and females.
Results:
Renal vein variations were observed in 358 patients (24.7 %, 358/1,452), which included 103 patients (7.1 %, 103/1,452) with left renal vein (LRV) variations, 279 patients (19.2 %, 279/1,452) with right renal vein (RRV) variations and 24 patients (1.7 %, 24/1,452) with bilateral renal vein variations. The frequency of RRV variations was significantly higher than that of LRV variations (p < 0.05). No statistically significant correlation was found between variations of renal vein (LRV and RRV) and gender (p > 0.05). According to the morphology of the renal vein, we classified LRV variations into five types: type I, circumaortic LRV (2.1 %, 31/1,452); type II, retroaortic LRV (2.1 %, 30/1,452); type III, abnormal reflux (1.7 %, 24/1,452); type IV, late venous confluence of LRV (0.9 %, 13/1,452); type V, rare type (0.3 %, 5/1,452), and RRV variations into three types: type 1, additional renal vein (18.7 %, 271/1,452); type 2, abnormal reflux (0.4 %, 6/1,452); type 3, rare type (0.1 %, 2/1,452).
Conclusion:
The renal vein variations are not unusual, particularly in the RRV. Anomalies of the LRV are more complex than those of the RRV. The renal vein anatomy can be well depicted by MDCT angiography. Our new classification of the renal vein variations will improve the recognition of the renal vein morphology preoperatively.
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