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* <spoiler text="What immunohistochemical stains would you do?">CD15, CD30, and PAX5 would stain tumor cells in Hodkin lymphoma. Mart1, HMB45, and S100 could be used to rule out melanoma. Other additional stain in a lymphoma versus melanoma workup might include CD3, CD20, and keratin.</spoiler>
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===Cytology===
* '''Positive for malignancy, the differential diagnosis includes melanoma and Hodgkin lymphoma'''.
===Biopsy===
<gallery heights="250px" widths="250px">
CytologicallyYoursCoW20131202Biopsy1.jpg|20x magnification of lymph node core biopsy.
CytologicallyYoursCoW20131202Biopsy2.jpg|40x magnification of lymph node core biopsy.
CytologicallyYoursCoW20131202Biopsy3.jpg|CD 15 with membranous staining.
CytologicallyYoursCoW20131202Biopsy4.jpg|CD 30 with membranous staining.
</gallery>
===Biopsy===