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Case Report


Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report

Chihiro Kanno, Shogo Sato, Izumi Yamauchi, Mai Shimamura, Yosuke Maeda, Fumiaki Takahashi.


Abstract
Background:
Obstructive urolithiasis is an important urinary tract disorder in male small ruminants and is usually recognized as lower urinary tract obstruction. Upper urinary tract involvement may be overlooked when gastrointestinal or systemic signs predominate.

Case Description:
A three-year-two-month-old Corriedale wether sheep was presented with anorexia, lethargy, foul-smelling diarrhea, and pale mucous membranes. Parasitic enteritis was initially suspected. Hematology and serum biochemistry revealed marked azotemia, hypermagnesemia, hypocalcemia, hypochloremia, and an increased anion gap. Despite supportive treatment, the sheep deteriorated and was euthanized for animal welfare reasons. Gross necropsy revealed right hydronephrosis, a calculus obstructing the right ureter, ureteral mucosal ulceration, bilateral renal pelvic hemorrhage, small uroliths and urinary sediment in the urinary bladder, and bladder mucosal petechiae. No urinary bladder rupture was observed. Infrared spectrophotometric analysis identified calcium carbonate as the predominant component of the right ureteral calculus.

Conclusion:
Calcium carbonate urolithiasis in adult wether sheep may involve the ureter and contribute to severe renal dysfunction without typical signs of distal urethral obstruction. Urolithiasis should be considered in adult sheep with nonspecific systemic deterioration, especially when urination cannot be confirmed.

Key words: Azotemia; Calcium carbonate; Sheep; Ureteral obstruction; Urolithiasis.


 
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How to Cite this Article
Pubmed Style

Kanno C, Sato S, Yamauchi I, Shimamura M, Maeda Y, Takahashi F. Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report. Open Vet. J.. 2026; 16(8): 5881-5887. doi:10.5455/OVJ.2026.v16.i8.76

Web Style

Kanno C, Sato S, Yamauchi I, Shimamura M, Maeda Y, Takahashi F. Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report. https://www.openveterinaryjournal.com/?mno=320512 [Access: August 20, 2026]. doi:10.5455/OVJ.2026.v16.i8.76

AMA (American Medical Association) Style

Kanno C, Sato S, Yamauchi I, Shimamura M, Maeda Y, Takahashi F. Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report. Open Vet. J.. 2026; 16(8): 5881-5887. doi:10.5455/OVJ.2026.v16.i8.76


Vancouver/ICMJE Style

Kanno C, Sato S, Yamauchi I, Shimamura M, Maeda Y, Takahashi F. Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report. Open Vet. J.. (2026), [cited August 20, 2026]; 16(8): 5881-5887. doi:10.5455/OVJ.2026.v16.i8.76


Harvard Style

Kanno, C., Sato, . S., Yamauchi, . I., Shimamura, . M., Maeda, . Y. & Takahashi, . F. (2026) Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report. Open Vet. J., 16 (8), 5881-5887. doi:10.5455/OVJ.2026.v16.i8.76


Turabian Style

Kanno, Chihiro, Shogo Sato, Izumi Yamauchi, Mai Shimamura, Yosuke Maeda, and Fumiaki Takahashi. 2026. Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report. Open Veterinary Journal, 16 (8), 5881-5887. doi:10.5455/OVJ.2026.v16.i8.76


Chicago Style

Kanno, Chihiro, Shogo Sato, Izumi Yamauchi, Mai Shimamura, Yosuke Maeda, and Fumiaki Takahashi. "Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report." Open Veterinary Journal 16 (2026), 5881-5887. doi:10.5455/OVJ.2026.v16.i8.76


MLA (The Modern Language Association) Style

Kanno, Chihiro, Shogo Sato, Izumi Yamauchi, Mai Shimamura, Yosuke Maeda, and Fumiaki Takahashi. "Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report." Open Veterinary Journal 16.8 (2026), 5881-5887. Print. doi:10.5455/OVJ.2026.v16.i8.76


APA (American Psychological Association) Style

Kanno, C., Sato, . S., Yamauchi, . I., Shimamura, . M., Maeda, . Y. & Takahashi, . F. (2026) Calcium carbonate urolithiasis with ureteral obstruction in an adult wether sheep: A case report. Open Veterinary Journal, 16 (8), 5881-5887. doi:10.5455/OVJ.2026.v16.i8.76


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