Primary lymphedema is most likely caused by which of the following?

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Multiple Choice

Primary lymphedema is most likely caused by which of the following?

Explanation:
Primary lymphedema happens when there is an intrinsic problem with the lymphatic system, present from birth or developing early. The classic cause is lymphatic hypoplasia, meaning the lymphatic vessels are underdeveloped, so lymph drainage is impaired and swelling occurs. This sets it apart from secondary lymphedema, which results from external factors that damage or block lymphatics—tumor obstruction or radiation therapy can do this, and chronic venous insufficiency causes edema through venous, not lymphatic, failure. So, lymphatic hypoplasia best explains primary lymphedema.

Primary lymphedema happens when there is an intrinsic problem with the lymphatic system, present from birth or developing early. The classic cause is lymphatic hypoplasia, meaning the lymphatic vessels are underdeveloped, so lymph drainage is impaired and swelling occurs. This sets it apart from secondary lymphedema, which results from external factors that damage or block lymphatics—tumor obstruction or radiation therapy can do this, and chronic venous insufficiency causes edema through venous, not lymphatic, failure. So, lymphatic hypoplasia best explains primary lymphedema.

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