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** Findings on [[CT urography]] suggestive of [[renal papillary necrosis]] include multiple small accumulations of [[contrast media]] in the [[papillary]] regions. <ref name="pmid28076022">{{cite journal| author=Kawamoto S, Duggan P, Sheth S, Miyamoto H, Kazi ZN, Fishman EK| title=Renal Papillary and Calyceal Lesions at CT Urography: Genitourinary Imaging. | journal=Radiographics | year= 2017 | volume= 37 | issue= 1 | pages= 358-359 | pmid=28076022 | doi=10.1148/rg.2017160089 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28076022  }} </ref>
** Findings on [[CT urography]] suggestive of [[renal papillary necrosis]] include multiple small accumulations of [[contrast media]] in the [[papillary]] regions. <ref name="pmid28076022">{{cite journal| author=Kawamoto S, Duggan P, Sheth S, Miyamoto H, Kazi ZN, Fishman EK| title=Renal Papillary and Calyceal Lesions at CT Urography: Genitourinary Imaging. | journal=Radiographics | year= 2017 | volume= 37 | issue= 1 | pages= 358-359 | pmid=28076022 | doi=10.1148/rg.2017160089 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28076022  }} </ref>
** The lobster claw sign is a diagnostic finding on [[CT]] [[urography]] in the papillary subtype of [[renal papillary necrosis]] that develops due to elongation of the [[minor calyx]] fornices following [[ischemia]] and destruction of the [[renal]] [[papilla]]. <ref name="pmid30309154">{{cite journal| author=Xiang H, Han J, Ridley WE, Ridley LJ| title=Lobster claw sign: Renal papillary necrosis. | journal=J Med Imaging Radiat Oncol | year= 2018 | volume= 62 Suppl 1 | issue=  | pages= 90 | pmid=30309154 | doi=10.1111/1754-9485.37_12784 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=30309154  }} </ref>
** The lobster claw sign is a diagnostic finding on [[CT]] [[urography]] in the papillary subtype of [[renal papillary necrosis]] that develops due to elongation of the [[minor calyx]] fornices following [[ischemia]] and destruction of the [[renal]] [[papilla]]. <ref name="pmid30309154">{{cite journal| author=Xiang H, Han J, Ridley WE, Ridley LJ| title=Lobster claw sign: Renal papillary necrosis. | journal=J Med Imaging Radiat Oncol | year= 2018 | volume= 62 Suppl 1 | issue=  | pages= 90 | pmid=30309154 | doi=10.1111/1754-9485.37_12784 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=30309154  }} </ref>
**other diagnostic finding include<ref name="urlRenal papillary necrosis | Radiology Reference Article | Radiopaedia.org">{{cite web |url=https://radiopaedia.org/articles/renal-papillary-necrosis?lang=us |title=Renal papillary necrosis &#124; Radiology Reference Article &#124; Radiopaedia.org |format= |work= |accessdate=}}</ref>:
**Other diagnostic finding include<ref name="urlRenal papillary necrosis | Radiology Reference Article | Radiopaedia.org">{{cite web |url=https://radiopaedia.org/articles/renal-papillary-necrosis?lang=us |title=Renal papillary necrosis &#124; Radiology Reference Article &#124; Radiopaedia.org |format= |work= |accessdate=}}</ref>:
***ball on tee
***ball on tee
***[[signet ring]]
***[[signet ring]]
***sloughed [[papilla]] with calyces clubbing
***sloughed [[papilla]] with [[calyces]] [[clubbing]]
<br>
<br>
[[File:Lobster-claw-sign-papillary-necrosis-normal.jpg|300px|thumb|left|Normal papillary system.<ref>Case courtesy of Dr Matt A. Morgan, <a href="https://radiopaedia.org/">Radiopaedia.org</a>. From the case <a href="https://radiopaedia.org/cases/40421">rID: 40421</a></ref>]]
[[File:Lobster-claw-sign-papillary-necrosis-normal.jpg|300px|thumb|left|Normal papillary system.<ref>Case courtesy of Dr Matt A. Morgan, <a href="https://radiopaedia.org/">Radiopaedia.org</a>. From the case <a href="https://radiopaedia.org/cases/40421">rID: 40421</a></ref>]]

Revision as of 06:30, 21 August 2020

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Nasrin Nikravangolsefid, MD-MPH [2]

Overview

CT urography is helpful in the diagnosis of renal papillary necrosis that shows multiple small accumulations of contrast media in the papillary regions near the calyx system.

Key CT Findings in Renal papillary necrosis


Normal papillary system.[4]
Lobster claw sign in papillary necrosis.[5]




References

  1. 1.0 1.1 1.2 Kawamoto S, Duggan P, Sheth S, Miyamoto H, Kazi ZN, Fishman EK (2017). "Renal Papillary and Calyceal Lesions at CT Urography: Genitourinary Imaging". Radiographics. 37 (1): 358–359. doi:10.1148/rg.2017160089. PMID 28076022.
  2. Xiang H, Han J, Ridley WE, Ridley LJ (2018). "Lobster claw sign: Renal papillary necrosis". J Med Imaging Radiat Oncol. 62 Suppl 1: 90. doi:10.1111/1754-9485.37_12784. PMID 30309154.
  3. "Renal papillary necrosis | Radiology Reference Article | Radiopaedia.org".
  4. Case courtesy of Dr Matt A. Morgan, <a href="https://radiopaedia.org/">Radiopaedia.org</a>. From the case <a href="https://radiopaedia.org/cases/40421">rID: 40421</a>
  5. Case courtesy of Dr Matt A. Morgan, <a href="https://radiopaedia.org/">Radiopaedia.org</a>. From the case <a href="https://radiopaedia.org/cases/40421">rID: 40421</a>