Final answer:
Lymphedema occurs when there is an accumulation of lymph fluid in the tissues due to damage or removal of lymph nodes.
Step-by-step explanation:
Lymphedema is a condition that occurs when there is an accumulation of lymph fluid in the tissues, leading to swelling. In the case of a left modified radical mastectomy with axillary node dissection, lymphedema can occur when there is damage or removal of lymph nodes in the armpit area. This can disrupt the normal flow of lymph fluid, causing it to accumulate and result in swelling.
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