图示：凹陷性水肿
液体在组织间隙积聚形成水肿。体格检查时，手指按压相应皮肤和软组织，手指离开后凹陷不能立即恢复。
Here is simple edema, or fluid collection within tissues. This is "pitting" edema because, on physical examination, you can press your finger into the skin and soft tissue and leave a depression.