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Evaluate imaging techniques for diagnosing urinary bladder torsion in a dog after vaginal mass resection.

March 14, 2026Open Access

Ultrasound, Retrograde Urethrography, and Computed Tomography Diagnosis of Urinary Bladder Torsion in a Dog After Resection of a Vaginal Mass

JLJ.-S. LeeKyungpook National University JKJ. S. KangSeoul National University Hospital YOYe‐In OhKyungpook National University

Key Points

Evaluate imaging techniques for diagnosing urinary bladder torsion in a dog after vaginal mass resection.
Abdominal ultrasound to assess hydronephrosis and bladder dilation.
Retrograde urethrography to confirm urethral opening position.
Computed tomography to visualize urethral abnormalities and torsion.
Confirmed urinary bladder torsion based on surgical findings.
Identified abnormal urethral opening positioning and bilateral ureterovesical junctions.

Abstract

An 11-year-old female Shih Tzu exhibited dysuria after removal of a large vaginal mass. Abdominal ultrasound revealed bilateral hydronephrosis, hydroureter, and urinary bladder (UB) dilation. The urethral opening was located ventral to the UB, cranial to its normal position. The right ureterovesical junction (UVJ) opened on the ventral aspect of the UB, left of the urethral opening; the left ureter coursed abruptly ventrally at the UB level. Retrograde urethrography confirmed the abnormal position of the urethral opening. Computed tomography demonstrated abnormal positioning of the urethral opening and bilateral UVJs, along with distal ureter rotation. Surgical findings confirmed UB torsion.

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