Ultrasonogram of the left kidney in transverse view in a six-year-old alpaca. Note the “euro-sign” shape of the medullary pyramids (MP) due to the precise medial scan at the level of the hilus (H), as viewed from the left paralumbar fossa using a 6.6 MHz probe. The distance between lateral and medial margins and between the renal cortex and medullary pyramids were measured. C cortex, AW abdominal wall, S spleen, cr cranial, cd caudal