How can you differentiate palpable rumen distension from distended abomasum on palpation?

• A. Rumen distension is typically left-sided; abomasal distension is usually right-sided with a different ping location and signs such as postprandial tympany and other.
• B. Rumen distension is typically right-sided; abomasal distension is usually left-sided with identical ping.
• C. Both are typically left-sided.
• D. Abomasal distension presents with no pings.

Answer: (C)

The key idea is where you hear the ping when you percuss and palpate. The rumen sits on the left side of the abdomen, so a distended rumen typically produces a tympanic (drum-like) ping best felt in the left paralumbar fossa. The abomasum lies on the right side, along the ventral right abdomen, so a distended abomasum usually yields a ping on the right side. Because of this anatomical arrangement, left-sided distension points to the rumen, while right-sided distension points to the abomasum, and the clinical signs will often align with that location. Saying both distensions are left-sided contradicts the normal anatomy, so the left-versus-right distinction is the most reliable differentiator.