Final answer:
Lymphedema is the condition caused when interstitial fluid does not return to the cardiovascular system properly and accumulates in the tissues.
Step-by-step explanation:
The condition caused when interstitial fluid does not return to the cardiovascular system properly and accumulates in the tissues is called lymphedema. Lymphedema occurs when there is a blockage or damage to the lymphatic system, which is responsible for returning lymph fluid to the bloodstream. This can lead to swelling and discomfort in the affected areas of the body.
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