retroauricular lymph node

ret·ro·au·ric·u·lar lymph node

(ret'rō-awr-ik'yū-lăr limf nōd)
One of two or three nodes in the region of the mastoid process, which receive afferent lymphatic vessels from the scalp and auricle and send efferent vessels to the superior deep cervical nodes.
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Swelling of the retroauricular lymph nodes and even signs of pseudomastoiditis might also occur.