Swelling of the right psoas.

右腰大肌肿胀。

The left kidney and psoas shadows may be indistinct.

左肾和腰肌阴影可模糊不清。

The posterior pararenal spaces may extend posterolateral to psoas.

肾旁后间隙向内侧可延伸至腰大肌的后外侧缘。

The psoas (major on the right) is a very strong and powerful muscle.

腰肌（主要是右侧）是非常强壮有力的肌肉。

At each segment, the psoas muscle, lumbar plexus, and nerve roots were dissected.

在每个节段均暴露出腰大肌、腰丛和神经根。