Testicular Signet-Ring Cell Metastasis from a Carcinoma of Unknown Primary Site: A Case Report and Literature Review

Figure 2

(a) The testicular parenchyma is infiltrated by neoplastic signet-ring cells (hematoxylin-eosin ×200). (b) Tumor cells exhibit positivity for mucin stains (arrows). (c) Immunohistochemically the tumor cells were positive for cytokeratin 20 (arrows).

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(b)

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