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Case Reports
. 2025 Feb 5:2025:3429069.
doi: 10.1155/crve/3429069. eCollection 2025.

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

Kacper Żebrowski  1 , Małgorzata Kandefer-Gola  1 , Jolanta Bujok  2 , Wojciech Borawski  3 , Stanisław Dzimira  1
Affiliations
Case Reports

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

Kacper Żebrowski et al. Case Rep Vet Med. .

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.

Keywords: dog; haemangiosarcoma; kidney; metastasis; neoplasm; ureter.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Ultrasound image of the tumour and the kidney. The study shows an extensive heteroechoic tumour (arrowhead) originating from the initial part of the ureter and completely occupying its lumen, causing obstruction and urinary stasis in the kidney (arrow).
Figure 2
Figure 2
Cross-sectional multiplanar computed tomography reconstruction image with intravenous contrast injection. (A) Axial, (B) sagittal, and (C) dorsal sections show a kidney (arrow) with features of moderate hydronephrosis and a severely dilated initial portion of the ureter (⁣∗). The dilated part of the ureter shows irregular postcontrast enhancement both within the wall and its lumen.
Figure 3
Figure 3
Gross view of a ureteral tumour (black arrow) with the left kidney (white arrow). There is a large area of necrosis (x) and haemorrhage (⁣∗) on the cross-section of the tumour.
Figure 4
Figure 4
Histopathological examination revealed a ureteral haemangiosarcoma. It consists of large spindle-shaped cells, less often oval to round (⁣∗). Irregular blood vessels filled with erythrocytes are also present (arrows). H&E stain, ×40.
See this image and copyright information in PMC

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