Ultrasonogram of the triangular shape of the left kidney in sagittal view in a four-year-old alpaca. The shape of the left kidney of an alpaca with the echoic cortex (C) and anechoic medullary pyramids (MP) as viewed from the left paralumbar fossa using a 6.6 MHz probe; H hilus, CA capsule, AW abdominal wall, S spleen, cr cranial, cd caudal