Weigert–Meyer law

Short description: Urology

The Weigert–Meyer law is a concept in urology and radiology that describes the anatomical relationship of two ureters in a duplicated renal collecting system, as well as the resulting patterns of hydronephrosis, obstruction, and reflux.[1]

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.[2] 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.[2] The upper moiety has higher risk of obstruction due to greater likelihood of ureterocele or ectopic insertion.[2][3][4]

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.[2][3]

## References

1. ↑ El-Feky, Mostafa; Radswiki, The (2011-01-08), "Weigert-Meyer law" (in en-US), Radiopaedia.org, doi:10.53347/rID-12768, https://radiopaedia.org/articles/weigert-meyer-law?lang=us, retrieved 2025-02-10
2. ↑ 2.0 2.1 2.2 2.3 Meyer, Robert (1946). "Normal and abnormal development of the ureter in the human embryo; a mechanistic consideration". The Anatomical Record (PubMed) 96 (4): 355–371. doi:10.1002/ar.1090960403. PMID 20281492.
3. ↑ 3.0 3.1 Walizai, Tariq (31 October 2024). "Weigert-Meyer law". Online: Radiopaedia. https://radiopaedia.org/articles/weigert-meyer-law?lang=us.
4. ↑ Vergani, P; Locatelli, A (July 1, 1999). "Accuracy of prenatal ultrasonographic diagnosis of duplex renal system". Journal of Ultrasound in Medicine (Wiley) 18 (7): 463–467. doi:10.7863/jum.1999.18.7.463. PMID 10400048. https://onlinelibrary.wiley.com/doi/epdf/10.7863/jum.1999.18.7.463. Retrieved January 22, 2025.

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