lymph sacs

lymph sacs

the primordia of lymphatic vessels in the embryo.
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Lymphatic malformations or lymphangiomas are rare benign hamartomas that result from maldevelopment of primitive lymph sacs.
1) A blockage or arrest in the normal growth of primitive lymph channels during embryogenesis, 2) The primitive lymph sacs does not reach the venous system, 3) During embryogenesis, lymphatic tissue is laid in the wrong area.