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Four types of IMLN. (A) Type I, preserved lymphatic hilar structure, without thickened-cortex; (B) type II, local soft tissue thickening ≥6 mm, with or without nodular occupancy effect; (C,D) type III, preserved lymphatic hilar structure and thickened-cortex; (E,F) type IV, lymphatic hilar structure absent. IMLN, internal mammary lymph node.
