Draft:Weigert-Meyer Law
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The Weigert-Meyer Rule is a concept in urology and radiology that describes the anatomic relationship of two ureters in a duplicated renal collecting system, as well as the resulting patterns of hydronephrosis, obstruction, and reflux.
In most cases, the upper renal moiety drains to the more medial ureteral orifice and the lower renal moiety tends to drain to the more lateral orifice.[1] The lower moiety often has a shorter muscular tunnel through the bladder wall due to the more lateral insertion, and is therefore more likely to reflux.[1] The upper moiety has higher risk of obstruction due to greater likelihood of ureterocele or ectopic insertion.[1][2][3]
This pattern was first described by German pathologist, Dr. Karl Weigert in 1877. This was further investigated by German pathologist, Dr. Robert Meyer, who described it as a "rule" in 1946.[1][2]
References
[edit]- ^ a b c d Meyer, Robert (1946). "Normal and abnormal development of the ureter in the human embryo; a mechanistic consideration". The Anatomical Record. 96 (4). PubMed: 355–371. doi:10.1002/ar.1090960403. PMID 20281492. Retrieved 22 January 2025.
- ^ a b Walizai, Tariq (31 October 2024). "Weigert-Meyer law". Radiopaedia.org. Online: Radiopaedia. Retrieved January 21, 2025.
- ^ Vergani, P; Locatelli, A (July 1, 1999). "Accuracy of prenatal ultrasonographic diagnosis of duplex renal system". Journal of Ultrasound in Medicine. 18 (7). Wiley: 463–467. doi:10.7863/jum.1999.18.7.463. PMID 10400048. Retrieved January 22, 2025.