Figure 1

A: CT slide of renal pelvis. [1] perirenal fat: orthographic to renal capsule and to line 2. [2] musculus erector spinae: thickness of the muscle in a parallel line to the dorsal process Figure 1B: CT slide of iliac crest. [3a] thickness of the musculus psoas in a parallel line to the dorsal process. [3b] area of the psoas muscle. [4] subcutaneous fat medial: parallel to the dorsal process. [5] subcutaneous fat lateral: parallel to the dorsal process starting at iliac spine posterior superior area of the psoas muscle.