Imaging diagnosis: biliopleural fistula in a dog.

A 3-year-old intact male Brittany Spaniel was admitted for thoracic gunshot wounds. Despite continued supportive care, the dog's condition deteriorated. Thoracic/abdominal ultrasound revealed a biliopleural fistula. Following fistula repair, the dog made a complete recovery. This case represented a diagnostic challenge because of the uncommon clinical presentation of a severe bile pleuritis in the absence of significant bile peritonitis. Biliopleural fistula is a rare condition but should be considered as a differential diagnosis in trauma patients with pleural effusion, especially those with penetrating thoracic injuries. Ultrasonography can be used to diagnose this disorder preoperatively.