Ureteral Haemangiosarcoma in a Dog: Rare Primary Tumour With Unusual Metastasis to the Contralateral Kidney

TL;DR

A dog was diagnosed with a rare ureteral tumor that spread to the opposite kidney, marking the first confirmed case of such metastasis.

Contribution

This paper reports the first confirmed case of ureteral haemangiosarcoma metastasis to the contralateral kidney in a dog.

Findings

Ureteral haemangiosarcoma was identified as the primary tumor in a 11-year-old Labrador retriever.

The tumor metastasized to the contralateral kidney two months after initial surgery.

This case represents the first confirmed instance of such metastasis in veterinary medicine.

Abstract

A dog (neutered male, 11 years old, Labrador retriever) underwent abdominal ultrasound, which revealed a 7 cm diameter tumour (caudal region of the left kidney). The animal showed symptoms of weight loss, apathy, haematuria, and abdominal pain. A computed tomography (CT) scan confirmed the presence of a tumour originating from the ureter. Following surgery to remove the ureter with the attached kidney, a histopathological examination was performed. The tumour was classified as a haemangiosarcoma. After the initial recovery, 2 months after surgery, the dog was diagnosed with a tumour in the other kidney. A fine needle biopsy was carried out. A haemangiosarcoma metastasis was suspected. Neoplasms of the ureter are a rare pathology. This is the first case in which metastasis to the second kidney has been confirmed.

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