Findings of an Extraluminal Leiomyosarcoma of the Urinary Bladder in a Dog

Wan-Ching Cheng ¹, Hock Gan Heng ², Hsin-Yeh Cheng ¹

⁰From the Department of Veterinary Medicine, Veterinary Medical Teaching Hospital (W.-C.C., H.-Y.C., K.-S.C.), College of Veterinary Medicine, National Chung, Hsing University, Taichung City, Taiwan.

Journal of the American Animal Hospital Association +

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April 25, 2024

View abstract on PubMed

Summary

A rare extraluminal leiomyosarcoma originating from the urinary bladder wall was diagnosed in a miniature poodle. This case highlights the importance of advanced imaging in diagnosing bladder tumors in dogs.

Area Of Science

Veterinary Medicine
Canine Oncology
Diagnostic Imaging

Background

Urinary bladder tumors are uncommon in dogs.
Leiomyosarcoma is a rare malignant tumor arising from smooth muscle tissue.
Extraluminal presentation of bladder tumors is infrequently reported.

Purpose Of The Study

To report a case of extraluminal urinary bladder leiomyosarcoma in a dog.
To describe the diagnostic imaging characteristics of this rare tumor.
To provide pathological and surgical findings.

Main Methods

Clinical presentation of a 9-year-old male miniature poodle with acute gastrointestinal signs and abdominal distension.
Physical examination revealing a caudal abdominal mass.
Diagnostic imaging including radiography, computed tomography (CT), and Doppler ultrasonography.
Surgical exploration and histopathological diagnosis.

Main Results

Radiography and CT identified a large, heterogeneous, mildly contrast-enhancing soft-tissue mass in the ventral abdomen, adjacent to the bladder.
Doppler examination showed minimal blood flow within the mass.
Surgery confirmed the mass originated from the urinary bladder wall.
Pathology diagnosed the mass as leiomyosarcoma.

Conclusions

This is the first reported case of extraluminal leiomyosarcoma of the bladder wall in a dog.
Advanced imaging modalities provided characteristic findings for this rare tumor.
Early diagnosis and surgical intervention are crucial for managing canine bladder tumors.