Question of the day

A 5-year-old female spayed Australian shepherd ...

A five-year-old female spayed Australian shepherd is presented for poor appetite and lethargy.

Bloodwork reveals hypercalcemia. Urinalysis is normal. Abdominal ultrasonography is unremarkable. Thoracic radiographs are shown below.

Which of the following choices is the most likely diagnosis?

Images courtesy, Veterinary Radiology

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