Skip to main content

Unilateral “white pyramid” sign in acute urinary tract obstruction

Graphical abstract

This is a preview of subscription content, access via your institution.

Data and material availability

Not applicable.


  1. Tublin ME, Tessler FN, McCauley TR, Kesack CD (1997) Effect of hydration status on renal medulla attenuation on unenhanced CT scans. AJR Am J Roentgenol 168(1):257–259.

    Article  CAS  PubMed  Google Scholar 

  2. Roychowdhury A, Makris J, Colby JM et al (1998) Unilateral absence of the “white pyramid” sign on non-contrast CT: a sign of tubular hydronephrosis? In: Presented at the 98th meeting of the American Roentgen Ray Society, scientific session 33, San Francisco, Calif, April 26–May 1, 1998

  3. Hsu CT, Wang ZJ, Yu AS et al (2008) Physiology of renal medullary tip hyperattenuation at unenhanced CT: urinary specific gravity and the NaCl concentration gradient. Radiology 247(1):147-153.

    Article  PubMed  Google Scholar 

  4. Kumar R, Wang ZJ, Fu Y, Forsythe C, Webb EM, Yeh BM (2010) Visualization of renal medullary hyperattenuation at unenhanced CT: what is the effect of furosemide administration? Radiology 255(2):495-500.

    Article  PubMed  Google Scholar 

  5. Li C, Wang W, Kwon TH, Knepper MA, Nielsen S, Frøkiaer J (2003) Altered expression of major renal Na transporters in rats with unilateral ureteral obstruction. Am J Physiol Renal Physiol. 284(1):F155-F166.

    Article  CAS  PubMed  Google Scholar 

Download references


No funding was received for this study.

Author information

Authors and Affiliations



All authors contributed equally in the collection of data, interpretation of the data, and preparation of manuscript.

Corresponding author

Correspondence to Piotr Palczewski.

Ethics declarations

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

Statement of informed consent was not applicable since the manuscript does not contain any patient data.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Bereźniak, M., Palczewski, P., Sułkowska, K. et al. Unilateral “white pyramid” sign in acute urinary tract obstruction. Abdom Radiol 47, 2277–2278 (2022).

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: