IS Case 438: Intramammary lymph node
Imaging Sciences URMC 2010
Publication Date: 2010-08-30
Intramammary lymph nodes are a common finding on breast imaging studies. They are typically less than 5 mm short axis and may lay along the course of a blood vessel. They are most commonly located in the upper outer quadrant, but can be seen in the superior central breast or rarely in the inferior breast. On MRI, lymph nodes demonstrate a low T1 and high T2 signal cortex surrounding a central fatty hilum. Reniform shape and a central fat-containing hilum are diagnostic imaging features on any imaging modality.
Nodal enlargement with effacement of the central hilum in the setting of an ipsilateral breast carcinoma raises concern for neoplastic spread. There are numerous causes of benign breast nodal enlargement, including HIV, rheumatoid arthritis, lupus, sarcoidosis, and regional dermatitis/cellulitis.
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