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What is your diagnosis? Gastric dilatation-volvulus (GDV) with secondary peritoneal effusion and splenic congestion or torsion.

A 1-year-old castrated male ferret was evaluated because of an acute onset of vomiting mucus and respiratory distress. Physical examination at the time of admission revealed that the ferret was lethargic and mildly dehydrated, had an increased respiratory effort, and was hypothermic (37.1°C [98.7°F]). Abdominal palpation elicited signs of pain and revealed splenomegaly. Results of serum biochemical analysis revealed that the ferret was hyperglycemic, hyponatremic, and hypokalemic. Radiographs of the abdomen were obtained (Figure 1).