The kidney has a fibrous capsule which is surrounded by perirenal fat. In ultrasound image a the right kidney is in the true midline as noted by the medial discontinuity of the renal parenchyma. Transducer position for kidney ultrasound in long axis a and short axis b planes.
Ultrasound anatomy and scanning methods fig.
The left kidney is more posterior and superior than the right kidney. The ureters are generally not well visualized by ultrasound but when distended may appear as a tubular structure extending inferiorly from the kidney figure 4. The midportion of the kidney is often called the midpole. Mild hydro or grade 1 minimal amount of urine producing slight distention of the collecting system may b due to any obstruction 10.
