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An 18-month-old approximately 320-kg (704-lb) Braunvieh-cross heifer was evaluated at the Oklahoma State University Boren Veterinary Medical Teaching Hospital because of a 3-day history of inability to rise from a recumbent position.
At the initial evaluation, the heifer was in lateral recumbency and unable to maintain a sternal position or to lift its head. Physical examination revealed a body condition score of 3/9. Rectal temperature, heart rate, and respiratory rate were within reference limits. A large, firm mass was present on the ventral aspect of the neck at the level of the thoracic inlet, and