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Peer-reviewed veterinary case report

Cat with extra kidney and undescended testicle causing abdominal mass

By Paradise, Danielle & Clark, David·Published in Journal of the American Animal Hospital Association·2013·NorthPaws Veterinary Center, United States·View original on PubMed

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Original publication title: Supernumerary kidney with ipsilateral cryptorchidism in a cat.

Species:
cat
Drinking & peeingCats

Plain-English summary

An 8-week-old male domestic longhair cat was brought in with an abdominal mass and an undescended testicle (cryptorchidism). A 2 cm mass was found in his abdomen, and an ultrasound showed it was a cystic mass near the right kidney. During surgery, the mass was identified as an extra kidney, which was separate from the normal right kidney. The extra kidney caused complications, leading to the removal of both the extra kidney and the undescended testicle. This case highlights a rare condition in cats where an extra kidney can cause abdominal issues.

People also search for: cat abdominal mass · cryptorchidism in cats · cat kidney problems · extra kidney in cats · cat surgery for kidney removal

Abstract

An 8 wk old male domestic longhair was presented with an abdominal mass and cryptorchidism. A 2 cm mass was palpable in the midabdomen. Ultrasonography confirmed a complex, septated, cystic mass adjacent and caudal to the right kidney. A normally appearing left kidney was present. Pathologic examination of the excised abdominal mass revealed it to be a kidney with an attached, normal caliber ureter. At surgery, this kidney was separate from the parenchyma of the second, cranial, right kidney. Subsequently, the second right kidney became hydronephrotic and was removed together with the cryptorchid testis and an apparently hypoplastic ureter. This is the first report of a supernumerary kidney in a cat, adding it to the differential diagnoses of abdominal masses.

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Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/23861269/