Most likely LN: This is most likely a lymph node (you can also feel them in the groin and neck areas0. 4 mm is indeterminate in size (thus within the range of sizes for a normal lymph node). The only way to know if it is connected with the cancer is a followup MRI in 4 to 6 months to see if it is getting bigger.
Answered 12/30/2016
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