Urate nephrolithiasis in a northern elephant seal (Mirounga angustirostris) and a California sea lion (Zalophus californianus)

Sophie Dennison, Frances Gulland, Martin Haulena, Helio De Morais, Kathleen Colegrove

Research output: Contribution to journalReview articlepeer-review

Abstract

Nephrolithiasis has rarely been reported in marine mammals. During 2004 and 2005, two cases of nephrolithiasis were diagnosed during routine necropsy examination, one in a northern elephant seal (Mirounga angustirostrix) and one in a California sea lion (Zalophus californianus). Nephroliths were found throughout both kidneys during necropsy examination, varying in size from 1-10 mm in diameter in the northern elephant seal and from 1-15 mm in diameter in the California sea lion. Necropsy and histopathology revealed nephroliths in association with renal pelvic dilation and pyelonephritis in both animals. In addition, hydronephrosis was noted in the sea lion. Nephroliths were composed of uric acid and ammonium urate in the northern elephant seal and of ammonium urate in the California sea lion. The underlying disease leading to nephrolith formation was not determined; however, it is hypothesized that unknown metabolic derangements due to morphologic or physiologic differences may have played a role. This is the first report of urate nephrolithiasis in the California sea lion and northern elephant seal.

Original languageEnglish (US)
Pages (from-to)114-120
Number of pages7
JournalJournal of Zoo and Wildlife Medicine
Volume38
Issue number1
DOIs
StatePublished - Mar 1 2007
Externally publishedYes

Keywords

  • California sea lion
  • Mirounga angustirostris
  • Nephrolithiasis
  • Northern elephant seal
  • Urate nephrolith
  • Zalophus californianus

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

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