A 54-Year-Old Male Presents with an Enlarged Left-Sided Supraclavicular Lymph

A 54-year-old male presents with an enlarged left-sided supraclavicular lymph node.  The node is painless and stony hard on palpation.  The node biopsy reveals anaplastic cells that stain positive for keratin.  Which of the following is the most likely origin of the cells detected on the biopsy?

A) Lymphocytes
B) Epithelial surfaces
C) Muscle tissue
D) Endothelium
E) Glial cells

Correct Answer:

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