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In an RPO position, which kidney is best demonstrated?

  1. Right kidney

  2. Left kidney

  3. Both kidneys equally

  4. Neither kidney

The correct answer is: Left kidney

In an RPO (Right Posterior Oblique) position, the anatomy being visualized is oriented such that the left kidney is best demonstrated. This position allows for better visualization of the left kidney because it is moved posteriorly and is less superimposed by surrounding structures when the patient is in this oblique position. The right kidney, on the other hand, will be more oblique and obscured due to the positioning and the anatomy of the body. The RPO position rotates the patient, which creates an angle that enhances the clarity of the left kidney's outline. This positioning is particularly useful in obtaining clearer images or for diagnostic purposes related to the left renal anatomy.