Normal kidneys measure 11-13 cm in length with a tendency for the right kidney to be slightly smaller (up to 1 cm) compared to the left. Typical parenchymal thickness is 1.7 + 0.3 cm . Parenchymal volume is a more accurate parame
Fig. 19a-e. Asymmetric kidney size and function due to severe renal artery stenosis (a-d). Also note spin de-phasing on 3D phase contrast at and just distal to the renal artery stenosis (arrowin e)
c ter. Hemodynamically significant renal artery stenosis reduces perfusion pressure within the kidney, causing it to decrease in length and volume (Fig. 19). Chronic ischemia destroys nephrons resulting in gradual renal atrophy, further reducing length, parenchymal thickness and volume. Whenever a kidney with a stenotic renal artery is more than 1 cm smaller than the contralateral kidney, the possibility of hemodynamic significance should be considered with greater suspicion. In one study, renal volume measurements showed high sensitivity (91%) and negative predictive value (80%) in predicting the outcome of percute-nous transluminal renal angioplasty (PTRA) .
Was this article helpful?
This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.