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Wedge-shaped lymphoid depletion and sinus distention is described in the pole of an intramammary lymph node. The origin of the lesion appears to be traumatic venous thrombosis. Topographically the lesion differs from spontaneous venous infarction of lymph nodes, and resembles segmented infarction due to small arterial lesions. The usually localised trauma of fine-needle aspiration appears to account for its distinctive microanatomical distribution.