NAVLE® Question of the day

A young adult terrier cross dog is presented for inability to gain weight, vomiting, and poor appetite. The owner had adopted the dog from a shelter several days earlier after he had been found in an emaciated state.

On physical examination, he had poor body condition (3/9) and abdominal palpation revealed a tense abdomen with gassy enlarged loops of bowel and a firm linear structure.

Abdominal radiographs are shown below. 

Which one of the following choices is the most likely diagnosis?

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