CAMRT Radiography Practice Exam

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A left posterior oblique for a nephrogram will demonstrate which structures?

Right ureter and right kidney
Left ureter and left kidney
Left ureter and right kidney
Right ureter and left kidney

The correct answer is: Left ureter and right kidney

In a left posterior oblique (LPO) position for a nephrogram, the main focus is to visualize the anatomy of the kidneys and related structures in a manner that maximizes clarity and minimizes superimposition. The left posterior oblique position rotates the patient so that the left side is positioned more posteriorly compared to the right side. In this orientation, the right kidney, which sits slightly lower than the left kidney due to the anatomical positioning of the liver, becomes more prominently displayed. At the same time, the left ureter is positioned in a way that helps to better visualize its course as it runs close to the left kidney. This positioning aids in distinguishing these structures because the left kidney is angled away, reducing overlap with the right kidney, and the left ureter can be traced more easily without significant obstruction by the bowel or other tissues. Consequently, viewing the nephrogram from this angle allows for optimal assessment of the left ureter paired with the visibility of the right kidney. This is crucial for diagnosing potential issues with renal function or diagnosing obstructions in the urinary tract.